<p>US Patents - Shaped Charges - Filed 1946 to 1958 Compiled by Noel Atzmiller Patent Filing Date Patent Title Inventor Assigner</p><p>2399211 March 1942 Method of Perforating Well Casings Clyde O. Davis DuPont</p><p>2605703 July 1944 Liner for Hollow Charges Walter E. Lawson DuPont</p><p>2494256 September 1945 Apparatus for Perforating Well Casings and Well Walls Morris Muskat Gulf Research and Development Company</p><p>2628559 February 1946 Explosive Drill Raymond Jasse Societe dite: Centre d’Etudes (Paris, France)</p><p>2587243 October 1946 Cutting Apparatus William G. Sweetman I. J. McCullough</p><p>2543814 December 1946 Means and Method of Tilting Explosive Charges in Wells W. H. Thompson WELEX, Inc.</p><p>2779278 February 1947 Apparatus for Perforating Well Casings Robert L. Klotz Jr. Borg-Warner Corporation</p><p>2630182 February 1947 Method for Shooting Oil Wells Robert L. Klotz, Jr. Seismograph Services Corporation</p><p>2649046 May 1947 Explosive Package Clyde O. Davis DuPont</p><p>2506836 June 1947 Device for Detonating Explosives in Oil Wells Lloyd H. Kaltenberger Lloyd H. Kaltenberger</p><p>2696169 April 1948 Shaped Charge Well-Pipe Perforator Joseph B. Lassiter, Jr. Phillips Petroleum Company</p><p>2669928 June 1948 Perforating Device for Wells William G. Sweetman William G. Sweetman</p><p>2595960 October 1948 Explosive Device Robert W. Lawrence Hercules Powder Company</p><p>2655619 October 1948 Selective Charge-Firing Equipment William E. Neal William E. Neal</p><p>2680406 March 1949 Explosive Container for Gun Perforators John L. Austin Jet-Guns Company, Inc.</p><p>2734456 April 1949 Gun Perforator William G. Sweetman William G. Sweetman</p><p>2662474 July 1949 Well Casing Perforator George F. Turechek Lane-Wells Company</p><p>2707917 July 1949 Well Casing Perforator Will H. Lindsay, Jr. Lane-Wells Company</p><p>2764938 September 1949 Open Hole Carrier Robert T. Harcus Borg-Warner Corporation</p><p>2687823 September 1949 Gun Perforator Port Seal Raymond A. Whitmore Lane-Wells Company</p><p>2750885 November 1949 Aligning Means for Shaped Charge Perforating Apparatus Marcel Schlumberger Borg-Warner Corporation</p><p>2764937 November 1949 Apparatus for Perforating Well Casings by Means of Shaped Charges Marcel Schlumberger Borg-Warner Corporation</p><p>2679898 November 1949 Oriented Gun Perforating Valoris L. Forsyth Lane-Wells Company</p><p>2708408 November 1949 Well Perforating Device William G. Sweetman William G. Sweetman</p><p>2797892 December 1949 Explosive Apparatus M. A. Ryan Phillips Petroleum Company</p><p>2742857 January 1950 Gun Perforators George F. Turechek Lane-Wells Company</p><p>2994269 March 1950 Liquid-Responsive Explosive Charge Firing System Disabler Marcel Schlumberger Borg Warner</p><p>2667836 March 1950 Apparatus for the Use of Shaped Explosive Charges Joseph H. Church Joseph H. Church</p><p>2629325 May 1950 Jet Type Perforating Unit William G. Sweetman William G. Sweetman</p><p>1 US Patents - Shaped Charges - Filed 1946 to 1958 Compiled by Noel Atzmiller</p><p>2749841 August 1950 Hydraulic Acting Jet Gun for Perforating Well Casings Edward N. Jones Edward N. Jones</p><p>2749840 September 1950 Gun Perforators for Wells Earl Babcock Esso Research and Engineering Company</p><p>2796023 September 1950 Small Guns for Perforating Casing Guss F. Abendroth Guss F. Abendroth</p><p>2690123 September 1950 Jet Gun Perforator for Wells William E. Kanady Standard Oil Development Company</p><p>2639770 September 1950 Small Gun for Perforating Casing in Oil Wells Theodore A. Huber Standard Oil Development Company</p><p>2664158 September 1950 Gun for Perforating Casing Jerome G. McKean Standard Oil Development Company</p><p>2705920 September 1950 Automatic Firing Systems for Gun Perforators for Wells W. E. Kanady Esso Research and Engineering</p><p>2785631 October 1950 Shaped Explosive-Charge Perforating Apparatus Andre Blanchard Borg-Warner Corporation</p><p>2756677 October 1950 Well Perforating Device Ira J. McCullough McCullough Tool Company</p><p>2724333 November 1950 Protective Apparatus for Perforating Well Casings and the Like Frederick R. Seavy Olin Mathieson Chemical Corporation</p><p>2759417 November 1950 Electric Blasting Cap and Perforating Gun Containing Said Cap John. J. O’Neill, Jr. Olin Mathieson Chemical Corporation</p><p>2765739 January 1951 Jet Carrier Sealing Plug Henry H. Mohaupt WELEX, Inc.</p><p>2853944 February 1951 Apparatus for Perforating Well Casing and the Like Harry S. Robertson Borg-Warner Corporation</p><p>2844098 February 1951 Apparatus for Supporting Explosive Charges in Jet Type Perforating Guns Jacques H. Castel PGAC Development Company</p><p>2792783 March 1951 Shaped Charge Perforator Jacques Delacour Borg-Warner Corporation</p><p>2946283 March 1951 Method and Apparatus for Perforating Wellbores and Casings John. J. Udry Borg-Warner Corporation</p><p>2833213 April 1951 Well Perforator John J. Udry Borg-Warner Corporation</p><p>2821136 April 1951 Firing System for Jet Type Perforating Gun Jacques H. Castel PGAC Development Company</p><p>2703053 April 1951 Firing Circuit for Perforating Guns Jacques H. Castel Perforating Guns Atlas Corporation</p><p>2849953 May 1951 Shaped Charges Adapted for Use Inside Well Casings Jacques Delacour Borg-Warner Corporation</p><p>2733657 June 1951 Apparatus for Forming Perforations in Wells Charles M. Bryant Dow Chemical Company</p><p>2833214 August 1951 Gun Perforator Lloyd Spencer Lloyd Spencer</p><p>2761383 August 1951 Non-Expendable Gun for Use in Jet Perforating William G. Sweetman William G. Sweetman</p><p>2833215 August 1951 Gun Perforator and Method of Manufacture Lloyd Spencer Lloyd Spencer</p><p>2947250 September 1951 Shaped Charge Assembly and Gun Henry H. Mohaupt WELEX, Inc.</p><p>2782715 October 1951 Well Perforator John J. Udry Borg-Warner Corporation</p><p>2796022 October 1951 Shaped Charge Perforating Apparatus for Use in Wells and the Like Jacques Delacour Borg-Warner Corporation</p><p>2750884 October 1951 Blasting of Underground Formations Tom Gaines The Texas Company</p><p>2766690 November 1951 System for Setting Off Explosive Charges Maurice P. Lebourg Borg-Warner Corporation</p><p>2760434 January 1952 Explosive John A. Ruth Olin Mathieson Chemical Corporation</p><p>2 US Patents - Shaped Charges - Filed 1946 to 1958 Compiled by Noel Atzmiller</p><p>2892407 January 1952 Shaped Cavity Explosive Charge Norman A. MacLeod Norman A. MacLeod</p><p>2926603 March 1952 Well Perforator Shaped Charge Will H. Lindsay, Jr. Borg-Warner Corporation</p><p>2689007 April 1952 Gun Perforator for Wells Frank A. Beyer, Jr. Halliburton Oil Well Cementing Company</p><p>2796833 May 1952 Perforating Devices William G. Sweetman William G. Sweetman</p><p>2947251 October 1952 Shaped-Charge Well Perforator Louis F. Jilly Borg-Warner Corporation</p><p>2984307 October 1952 Cutting Apparatus Charles H. Barnes Schlumberger Well Surveying Corporation</p><p>2811921 November 1952 Shaped Explosive Charge Apparatus With Adjustable Charge Spacing Glen R. Hodgson Borg-Warner Corporation</p><p>2947252 December 1952 Shaped Charge Unit for Well Perforators Will H. Lindsay, Jr. Borg-Warner Corporation</p><p>2837995 December 1952 Unsymmetrically Encased Shaped Explosive Charges Jacques H. Castel PGAC Development Company</p><p>2819673 January 1953 Method of and Apparatus for Opening Oil- and Gas-Bearing Strata Clyde J. Cecil Dow Chemical Company</p><p>2908222 May 1953 Apparatus for Detonating Shaped Explosive Charges Andre Blanchard Borg-Warner Corporation</p><p>2846948 June 1953 Oil and Gas Well Perforating Methods and Apparatus Maurice P. Lebourg Borg-Warner Corporation</p><p>2873675 June 1953 Method and Apparatus for Detonating Explosive Devices in Bore Holes Maurice P. Lebourg Borg-Warner Corporation</p><p>2799224 June 1953 Apparatus for Perforating Casing Thomas L. Long Johnston Testers, Inc.</p><p>2980017 July 1953 Perforating Devices Jacques H. Castel PGAC Development Company</p><p>3018730 July 1953 Perforating Guns Jacques H. Castel PGAC Development Company</p><p>2935020 August 1953 Apparatus for Cutting Holes in Well Casing George C. Howard WELEX, Inc.</p><p>2873676 August 1953 Multiple Shaped Charge Assembly Blake M. Caldwell WELEX, Inc.</p><p>2883931 December 1953 Detonator Claude A. Houck Borg-Warner Corporation</p><p>2843041 December 1953 Deep Perforation of Subsurface Formations Douglass M. Stewart Esso Research and Engineering Company</p><p>2851918 January 1954 Method of Forming Shaped Explosive Charge Norman A. MacLeod Norman A. MacLeod</p><p>3067678 February 1954 Tilting Charge Well Perforating Assembly Blake M. Caldwell Halliburton Company</p><p>2906339 March 1954 Method and Apparatus for Completing Wells W. H. Griffin W. H. Griffin</p><p>2818808 April 1954 Jet Perforating Gun Winnefred S. Dill Winnefred S. Dill</p><p>2859697 June 1954 Well Perforating Device Thomas L. Long Johnston Testers, Inc.</p><p>2867172 July 1954 Detonation of Unprimed Base Charges Joseph R. Hradel Joseph R. Hradel</p><p>2876843 August 1954 Gun Perforator Theodore A. Huber Jersey Production Research Company</p><p>3071072 August 1954 Perforating Apparatus Jacques H. Castel PGAC Development Company</p><p>2916991 August 1954 Jet Gun Bruce Gilbert The Western Company</p><p>2947253 September 1954 Perforator Manuel Cirilo Borg-Warner Corporation</p><p>3 US Patents - Shaped Charges - Filed 1946 to 1958 Compiled by Noel Atzmiller</p><p>3067679 October1954 Well Perforating Assembly and Perforating Unit Therefore Blake M. Caldwell Halliburton Company</p><p>2895554 November 1954 Method and Apparatus for Perforating Well Casings R. F. Krueger Union Oil Company</p><p>2955533 December 1954 Well Bore Perforating Apparatus Samuel J. Martinez, Jr. Dow Chemical Company</p><p>2831429 February 1955 Shaped Charge for Perforating Oil Well Casing Allen B. Moore The Moore Tool Company</p><p>2889775 February 1955 Open Hole Perforator Firing Means Harrold D. Owen WELEX, Inc.</p><p>3016014 May 1955 Perforating Apparatus Maurice P. Lebourg Schlumberger Well Surveying Corporation</p><p>2896721 August 1955 Through-Tubing Perforating Systems William R. Cannaday Dresser Industries, Inc.</p><p>3031964 August 1955 Well perforating Method and Means Therefore John D. Chesnut Aerojet-General Corporation</p><p>3021784 September 1955 Shaped Charge Unit for Well perforators Lorrain D. Meddick Borg-Warner Corporation</p><p>2883932 September 1955 Well Perforating Firing Means Blake M. Caldwell WELEX, Inc.</p><p>2912930 October 1955 Perforating Assembly Blake M. Caldwell WELEX, Inc.</p><p>2925775 December 1955 Well Casing Perforator Donovan S. McKee Borg-Warner Corporation</p><p>2980018 January 1956 Well Perforator Shaped Charge George F. Turechek Borg-Warner Corporation</p><p>2986089 January 1956 Debris-Free Perforating Gun Lorrain D. Meddick Borg-Warner Corporation</p><p>2927534 February 1956 Perforating Device and Method of Perforating Wells Jake H. LeBus PGAC Development Company</p><p>2988993 February 1956 Firing System for Well Perforator Guy C. Throner, Jr. Aerojet-General Corporation</p><p>3107611 March 1956 Well Perforating Assembly B. M. Caldwell Halliburton Company</p><p>3107612 March 1956 Well Perforating Assembly B. M. Caldwell Halliburton Company</p><p>2915011 March 1956 Stabilizer for Well Casing Perforator Robert B. Hamill WELEX, Inc.</p><p>2924173 June 1956 Well Perforator Firing Means John J. Robertson WELEX, Inc.</p><p>2952319 June 1956 Method of Vertically Fracturing Cased Wells J. L. Popham Continental Oil Company</p><p>3054938 June 1956 Means and Mode for Depositing Material by Jet Perforation Lorrain D. Meddick Dresser Industries</p><p>2928658 June 1956 Sidewall Sampler Keith H. Miner Dresser Industries. Inc.</p><p>2889773 July 1956 Detonator Head Harold E. Staadt Dow Chemical Company</p><p>2968243 July 1956 Tubing Gun George F. Turechek Borg-Warner Corporation</p><p>3235005 October 1956 Shaped Explosive Charge Devices Jacques Delacour Schlumberger, Paris, France</p><p>3019731 December 1956 Jet Perforator for Well Casings Edwin D. Edwards Advanced Oil Tools, Inc.</p><p>2889774 January 1957 Gun Perforator Thomas O. Allen Jersey Production Research Company</p><p>2960930 April 1957 Well Perforating Apparatus Frederick H. Bell Jet Research Center, Inc.</p><p>2981185 April 1957 Well Perforating Apparatus Blake M. Caldwell Jet Research Center, Inc.</p><p>4 US Patents - Shaped Charges - Filed 1946 to 1958 Compiled by Noel Atzmiller</p><p>3025794 May 1957 Perforating Apparatus Maurice P. Lebourg Schlumberger Well Surveying Corporation</p><p>2990773 May 1957 Apparatus for Perforating Well Casing Lester W. Toelke Great Lakes Carbon Corporation</p><p>2974589 June 1957 Jet Perforators Paul John Bryan DuPont</p><p>3013333 August 1957 Restoration Process William R. Burke DuPont</p><p>2960931 September 1957 Jet Perforating Assembly for Oil Wells John J. Douglass DuPont</p><p>3013491 October 1957 Multiple-Jet Shaped Explosive Charge Perforating Device Thomas C. Poulter Borg-Warner Corporation</p><p>3043379 October 1957 Formation Sampler Forrest V. Porter Lane-Wells Company</p><p>2965031 October 1957 Well Bore Detector and perforating Apparatus Earl Johns Seismograph Service Corporation</p><p>2976940 November 1957 Formation Sampler Milo Surbatovich Dresser Industries</p><p>2990774 December 1957 Retrievable Carrier for a Shaped Charge Perforator Lester W. Toelke Great Lakes Carbon Corporation</p><p>3121389 December 1957 Shaped Explosive Charge Apparatus Jacques Delacour Schlumberger, Paris, France</p><p>3110257 March 1958 Well Perforating Method and Apparatus Maurice P. Lebourg Schlumberger Well Surveying Corporation</p><p>3014424 March 1958 Shaped Explosive Charge Jacques Delacour Schlumberger, Paris, France</p><p>3040659 May 1958 Well Perforating Device Otis J. McCullough McCullough Tool Company</p><p>3077834 July 1958 Lined Shaped Explosive Charge and Liner Therefore Blake M. Caldwell Jet Research Center, Inc.</p><p>3128701 July 1958 Shaped Charge Perforating Apparatus John S. Rinehart The Western Company</p><p>3036521 July 1958 Bore Hole Perforating Apparatus Harrold D. Owen Go Oil Well Services, Inc.</p><p>3064571 October 1958 Perforator for Well Casing Martin E. True Jersey Production Research Company</p><p>5</p>