Robert D. Wilkes

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Sanford, NC, US

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Patents Grantslast 30 patents

Information Patent Grant
Grey water filter tank recovery system and filter backwashing system
- Patent number 5,759,387
- Issue date Jun 2, 1998
- Essef Corporation
- Robert D. Wilkes
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Air relief valve for a pressure vessel
- Patent number 5,308,386
- Issue date May 3, 1994
- Essef Corporation
- Robert D. Wilkes
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Dynamic pressure relief seal for pressure vessels
- Patent number 5,121,852
- Issue date Jun 16, 1992
- Essef Corporation
- Robert D. Wilkes
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Dynamic pressure relief seal for pressure vessels
- Patent number 5,072,851
- Issue date Dec 17, 1991
- Essef Corporation
- Robert D. Wilkes
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL