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Jack Stifelman
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Bolivar, MO, US
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Patents Grants
last 30 patents
Information
Patent Grant
In-tank fluid filter with valve assembly
Patent number
6,217,755
Issue date
Apr 17, 2001
Donaldson Company, Inc.
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Spin-on filter assembly with valve arrangements
Patent number
6,024,869
Issue date
Feb 15, 2000
Donaldson Company, Inc.
Jack Stifelman
F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information
Patent Grant
High pressure hydraulic spin-on filter
Patent number
5,104,537
Issue date
Apr 14, 1992
Donaldson Company, Inc.
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Relief valve assembly; piston member from same and filter head asse...
Patent number
4,883,083
Issue date
Nov 28, 1989
Donaldson Company, Inc.
Patrick Fisher
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
High-strength filter with improved fatigue rating
Patent number
4,743,374
Issue date
May 10, 1988
Donaldson Company, Inc.
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Duplex filter apparatus
Patent number
4,615,800
Issue date
Oct 7, 1986
Donaldson Company, Inc.
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
High strength spin-on filter
Patent number
4,369,113
Issue date
Jan 18, 1983
Donaldson Company, Inc.
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Patents Applications
last 30 patents
Information
Patent Application
Re-usable structure which attaches to the same filter head as origi...
Publication number
20060021925
Publication date
Feb 2, 2006
Jack Stifelman
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL