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For the Inventor, By the Inventor

St. Louis Park, MN, United States of America

Masterson Engineering Inc.


USPTO Granted Patents = 3

Forward Citations = 15

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1 inventor (with patents filed for the assignee):

goldMedal Earl E Masterson (3 out of 6 patents)


3 patents:

1. D265085 - Phonograph (1982-06-22),
2. 4254959 - Phonograph tone arm control system (1981-03-10),
3. 4239239 - Phonograph tone arm system (1980-12-16),
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USPTO Data Jan 1 1976 - Jan 6 2026

3 Patents

#7 in St. Louis Park, MN

#1,948 in Minnesota

#72,067 in US

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St. Louis Park, MN, United States of America

Masterson Engineering Inc.

Forward Citations = 15

1 inventor:

goldMedal Earl E Masterson (3 out of 6 patents)

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