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For the Inventor, By the Inventor

Milford, NH, United States of America

Earthworks, Inc.


USPTO Granted Patents = 2

% Expired Patents = 50.0

Trademarks = 9

Forward Citations = 6

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2 inventors (with patents filed for the assignee):

goldMedal David E Blackmer (2 out of 17 patents)

silverMedal Aleksey S Khenkin (2 out of 4 patents)


2 patents:

1. 6526149 - System and method for reducing non linear electrical distortion in an electroacoustic device (2003-02-25),
2. 6091829 - Microphone apparatus (2000-07-18),
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USPTO Data Jan 1 1976 - Sep 29 2026

2 Patents

#18 in Milford, NH

#634 in New Hampshire

#94,730 in US

Milford, NH (US)
Milford, NH, United States of America

Earthworks, Inc.

Forward Citations = 6

2 inventors:

goldMedal David E Blackmer (2 out of 17 patents)

silverMedal Aleksey S Khenkin (2 out of 4 patents)

Please report any incorrect information to [email protected]
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