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EPO Patents = 2

Forward Citations = 17

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7 inventors (with patents filed for the assignee):

Wayne H Tuttle (5 out of 9 patents)

Ian Ballinger (4 out of 4 patents)

Conrad M Fritz (2 out of 3 patents)

4. Robert Manning (1 out of 2 patents)

5. Jeffry K Pearson (5 patents)

6. David Adams (1 patent)

7. Marcial Alexander Anaya (1 patent)

7 patents: Sort by Forward Citations

1. 10611503 - Center of mass control of liquid tanks for spacecraft use (2020-04-07),

2. 10479532 - Stress relieved welds in positive expulsion fuel tanks with rolling metal diaphragms (2019-11-19),

3. 10139047 - Stress relieved welds in positive expulsion fuel tanks with elastomeric diaphragm (2018-11-27),

4. 10088103 - Method of fabricating space satellite tank components utilizing additive manufacturing and spin forming (2018-10-02),

5. 9840752 - Method and apparatus for performing a localized post-weld heat treatment on a thin wall metallic cylinder (2017-12-12),

6. 4523793 - High-performance low-torque anti-friction bearing assembly (1985-06-18),

7. 4400042 - High performance low torque anti-friction bearing assembly (1983-08-23),

Keystone Engineering Company is a leading engineering firm that provides innovative solutions in the areas of civil, structural, and mechanical engineering. With over 20 years of experience, we specialize in designing and building high-quality infrastructure projects for various industries including oil and gas, petrochemical, and construction. Our team of highly skilled engineers and professionals are committed to delivering exceptional service to our clients, ensuring cost-effectiveness and timely project delivery. Visit our website to learn more about our services and projects.

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Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

7 Patents

#28 in Long Beach, CA

#9,205 in California

#38,792 in US

Long Beach, CA, United States of America

Keystone Engineering Company