Patrick R. Spearman

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Shoreview, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Stacked conical filtration or separation apparatus
- Patent number 6,692,639
- Issue date Feb 17, 2004
- Porous Media Corporation
- Patrick R. Spearman
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Grant
Two step filter and process
- Patent number 5,284,997
- Issue date Feb 8, 1994
- Porous Media Corporation
- Michael R. Spearman
- B09 - DISPOSAL OF SOLID WASTE RECLAMATION OF CONTAMINED SOIL SOIL
Information Patent Grant
Reinforced filter tube and method of making the same
- Patent number 4,836,931
- Issue date Jun 6, 1989
- Porous Media Corporation
- Michael R. Spearman
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Method of making a reinforced filter tube
- Patent number 4,814,033
- Issue date Mar 21, 1989
- Porous Media Corporation
- Michael R. Spearman
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL