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Charles A. Wilkins
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Ann Arbor, MI, US
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Patents Grants
last 30 patents
Information
Patent Grant
System for straining septic tank effluent before discharge to a dra...
Patent number
6,773,606
Issue date
Aug 10, 2004
Perfection Sprinkler Co.
Charles A. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Self-cleaning shallow water strainer
Patent number
6,508,933
Issue date
Jan 21, 2003
Perfection Sprinkler Co.
Thomas R. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Septic tank pump arrangement including a self-cleaning rotary strainer
Patent number
6,231,764
Issue date
May 15, 2001
Perfection Sprinkler Co.
Charles A. Wilkins
E03 - WATER SUPPLY SEWERAGE
Information
Patent Grant
Self-cleaning strainer having rotating strainer frame assembly jour...
Patent number
5,993,652
Issue date
Nov 30, 1999
Perfection Sprinkler Co.
James O. Stoneburner
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Rotary self-cleaning strainer having improved upper bearing seal
Patent number
5,520,808
Issue date
May 28, 1996
Perfection Sprinkler Co. (Michigan Corp)
James O. Stoneburner
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Use of a multi-apertured plastic pipe in the drive and structure of...
Patent number
5,356,532
Issue date
Oct 18, 1994
Perfection Sprinkler Co.
Thomas R. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Rotary self-cleaning strainer simultaneously cleaned and rotated by...
Patent number
5,108,592
Issue date
Apr 28, 1992
Perfection Sprinkler Co.
Thomas R. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Rotary self-cleaning strainer
Patent number
4,822,486
Issue date
Apr 18, 1989
Perfection Sprinkler Co.
Thomas R. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Patents Applications
last 30 patents
Information
Patent Application
System for straining septic tank effluent before discharge to a dra...
Publication number
20030085182
Publication date
May 8, 2003
Charles A. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Application
Self-cleaning shallow water strainer
Publication number
20010032810
Publication date
Oct 25, 2001
Thomas R. Wilkins
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL