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For the Inventor, By the Inventor

Aliso Viejo, CA, United States of America

D Squared Ventures


USPTO Granted Patents = 3

Forward Citations = 0

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2 inventors (with patents filed for the assignee):

goldMedal Harry Duane Romo (3 out of 81 patents)

silverMedal David Hagopian (3 out of 3 patents)


3 patents:

1. 12047729 - Ear-fitting headphone attachment apparatus (2024-07-23),
2. 11641540 - Ear-fitting headphone attachment apparatus (2023-05-02),
3. 11478093 - Travel pillow apparatus, storage apparatus for the travel pillow apparatus, and methods of manufacturing and using the same (2022-10-25),
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USPTO Data Jan 1 1976 - Sep 15 2026

3 Patents

#53 in Aliso Viejo, CA

#16,828 in California

#73,741 in US

Aliso Viejo, CA (US)
Aliso Viejo, CA, United States of America

D Squared Ventures

Forward Citations = 0

2 inventors:

goldMedal Harry Duane Romo (3 out of 81 patents)

silverMedal David Hagopian (3 out of 3 patents)

Please report any incorrect information to [email protected]
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