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David W. French
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Littleton, CO, US
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Patents Grants
last 30 patents
Information
Patent Grant
Sizing applicator
Patent number
4,579,078
Issue date
Apr 1, 1986
Manville Service Corporation
David W. French
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Grant
Apparatus for introducing a foamable plastic insulation into the sp...
Patent number
4,522,578
Issue date
Jun 11, 1985
J-M Manufacturing Co., Inc.
William W. Martin
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Sealing ring for spigot and socket pipe joint
Patent number
4,315,630
Issue date
Feb 16, 1982
Johns-Manville Corporation
David W. French
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Bell end of a bell and spigot joint
Patent number
4,258,935
Issue date
Mar 31, 1981
Johns-Manville Corporation
Peter Rodrigo
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Plastic pipe joint and method and assembly for making same
Patent number
4,231,983
Issue date
Nov 4, 1980
Johns-Manville Corporation
David W. French
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Method of post thickening one end section of a plastic pipe
Patent number
4,207,283
Issue date
Jun 10, 1980
Johns-Manville Corporation
David W. French
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Assembly for forming the bell of a bell spigot joint
Patent number
4,170,448
Issue date
Oct 9, 1979
Johns-Manville Corporation
David W. French
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL