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Gregory J. Drzewiecki
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Oak Lawn, IL, US
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last 30 patents
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Patent Grant
Apparatus for upgrade or repair of in-service pipelines
Patent number
5,577,528
Issue date
Nov 26, 1996
Southern California Gas Company
Narayan C. Saha
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Patent Grant
Combined hot tap pipe cutter and gate valve for plastic pipe
Patent number
5,269,340
Issue date
Dec 14, 1993
Institute of Gas Technology
Gregory J. Drzewiecki
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...