Douglas S. Hammond

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Newark, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Internally illuminated sign
- Patent number 5,664,878
- Issue date Sep 9, 1997
- Holophane Corporation
- Gregory J. Subisak
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Internally illuminated sign
- Patent number 5,588,742
- Issue date Dec 31, 1996
- Holophone Corporation
- Gregory J. Subisak
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Internally illuminated sign
- Patent number 5,355,291
- Issue date Oct 11, 1994
- Holophane Lighting, Inc.
- Gregory J. Subisak
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Internally illuminated sign
- Patent number 5,188,453
- Issue date Feb 23, 1993
- Holophane Company, Inc.
- Gregory J. Subisak
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Lighting system for illuminating billboards and the like
- Patent number 4,954,935
- Issue date Sep 4, 1990
- Holophane Company, Inc.
- Douglas S. Hammond
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Reflector for illuminating signs
- Patent number 4,575,783
- Issue date Mar 11, 1986
- Manville Service Corporation
- Douglas S. Hammond
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS