Trademarks = 1

Forward Citations = 194

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9 inventors (with patents filed for the assignee):

John Wippler (1 out of 2 patents)

Erwin J Fellner (1 out of 1 patent)

Charles J Arthur (1 out of 1 patent)

4. Donald G Davis (1 out of 1 patent)

5. David L Heitman (1 out of 1 patent)

6. Johannes A Van Haastert (1 out of 1 patent)

7. David C Brown (1 out of 1 patent)

8. James H Ryder (1 out of 2 patents)

9. Duane W Cowgill (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 4126131 - Facemask and goggle combination for excluding smoke or noxious gases (1978-11-21),

2. 4075715 - Helmet having anti-lift device (1978-02-28),

3. 4075714 - Helmet characterized by negative lift (1978-02-28),

4. 4059322 - Dust protective assembly for breakaway connectors (1977-11-22),

5. 4026245 - Personal restraint device (1977-05-31),

Company Overview

Sierra Engineering Co. is a leading engineering consulting firm specializing in civil engineering services. With a team of highly skilled professionals, we provide innovative and cost-effective solutions for a wide range of projects. Our services include site development, structural engineering, and construction management. We are committed to delivering high-quality results on time and within budget.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

5 Patents

#1 in Sierra Madre, CA

#12,070 in California

#51,620 in US

Sierra Madre, CA, United States of America

Sierra Engineering Co.

Forward Citations = 194

9 inventors:

John Wippler (1 out of 2 patents)

Erwin J Fellner (1 out of 1 patent)

Charles J Arthur (1 out of 1 patent)

4. Donald G Davis (1 out of 1 patent)

5. David L Heitman (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sierra Engineering Co.. Retrieved from https://idiyas.com/company/sierra-engineering-company

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]