Keith D. Marshall

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West Covina, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Wash basins
- Patent number D411876
- Issue date Jul 6, 1999
- Acorn Engineering Co.
- V. Walter Hafner
- D23 - Environmental heating and cooling
Information Patent Grant
Blow out toilet with low water volume usage
- Patent number 5,067,181
- Issue date Nov 26, 1991
- Acorn Engineering Company
- V. Walter Hafner
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Sprayhead with built-in soap system for multi person washfountains
- Patent number 4,698,860
- Issue date Oct 13, 1987
- Acorn Engineering Company
- V. Walter Hafner
- E03 - WATER SUPPLY SEWERAGE
Information Patent Grant
Vandal resistant and tamper proof pneumatic push button assembly fo...
- Patent number 4,682,533
- Issue date Jul 28, 1987
- Acorn Engineering Company
- V. Walter Hafner
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Dual operated metering valve connected to both a hand operated push...
- Patent number 4,630,644
- Issue date Dec 23, 1986
- Acorn Engineering Company
- V. Walter Hafner
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Rotating cap, screen and mounting means for protecting air metering...
- Patent number 4,630,638
- Issue date Dec 23, 1986
- Acorn Engineering Company
- V. Walter Hafner
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...