Douglas Hoffman

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San Diego, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Refilling a used ink cartridge
- Patent number 7,802,859
- Issue date Sep 28, 2010
- Hewlett-Packard Development Company, L.P.
- David A. Tyvoll
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Patents Applicationslast 30 patents

Information Patent Application
Refilling a used ink cartridge
- Publication number 20080100681
- Publication date May 1, 2008
- David A. Tyvoll
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS