For the Inventor, By the Inventor

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San Carlos, CA, United States of America

Telford Smith, Inc.

USPTO Granted Patents = 1

Forward Citations = 6

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1 inventor (with patents filed for the assignee):

Norman E Harthun (1 out of 9 patents)

1 patent: Sort by Forward Citations

1. 3982561 - Combination surge relief and back flow prevention valve (1976-09-28),

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USPTO Data Jan 1 1976 - Jan 13 2026

1 Patents

#134 in San Carlos, CA

#28,471 in California

#134,032 in US

San Carlos, CA, United States of America

Telford Smith, Inc.

Forward Citations = 6

1 inventor:

Norman E Harthun (1 out of 9 patents)

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