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For the Inventor, By the Inventor

Menlo Park, CA, United States of America

Donald W Penhale

This inventor holds 10 USPTO granted patents. Top assignees: Sri International, Pharmaceutical Delivery Systems, Inc., Sandoz Pharmaceuticals Corp.. Active years: 1981-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Donald W Penhale. Retrieved from https://idiyas.com/inventor/donald-w-penhale

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

USPTO Granted Patents = 10

% Patents Active = 100.0

Average Co-Inventor Count = 2.7

ph-index = 9

Forward Citations = 439(Granted Patents)


Location History:

  • Cupertino, CA (US) (1981 - 1985)
  • Menlo Park, CA (US) (1987 - 1991)

Company Filing History:

goldMedal4 out of 1,358 
 
Sri International
 patents
silverMedal3 out of 7 
 
Pharmaceutical Delivery Systems, Inc.
 patents
bronzeMedal2 out of 18 
 
Sandoz Pharmaceuticals Corp.
 patents
4. 1 out of 36 
 
Sandoz Pharm. Corp.
 patents

Years Active: 1981-1991

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10 patents (USPTO):Explore Patents
1. 5013821 - Ortho and thio-ortho ester polymer (1991-05-07),
2. 4957998 - Polymers containing acetal, carboxy-acetal, ortho ester and carboxyortho (1990-09-18),
3. 4946931 - Polymers containing carboxy-ortho ester and ortho ester linkages (1990-08-07),
4. 4898928 - Polyacetal and polyketal hydrogels formed from acetals or ketals and (1990-02-06),
5. 4855132 - Method of preparing bioerodible polymers having pH sensitivity in the (1989-08-08),
6. 4801457 - Polyacetal hydrogels formed from divinyl ethers and polyols (1989-01-31),
7. 4764364 - Method of preparing bioerodible polymers having pH sensitivity in the (1988-08-16),
8. 4713441 - Polyacetal hydrogels formed from divinyl ethers and polyols (1987-12-15),
9. 4513143 - Preparation of ketene acetals (1985-04-23),
10. 4304767 - Polymers of di- (and higher functionality) ketene acetals and polyols (1981-12-08),

Title: The Innovative Contributions of Donald W. Penhale

Introduction

Donald W. Penhale is a notable inventor based in Menlo Park, California. He has made significant contributions to the field of biodegradable polymers, holding a total of 10 patents. His work focuses on creating sustainable materials that have practical applications in various industries.

Latest Patents

Among his latest patents, Penhale has developed biodegradable ortho ester polymers based on mono- and poly-thiols. These polymers are designed for use in biodegradable sustained release agent dispensers. They contain specific mer units that include quadrivalent organic groupings and various hydrocarbyl or oxyhydrocarbyl components. Additionally, he has patented biodegradable polymers that incorporate acetal, carboxy-acetal, ortho ester, and carboxy-ortho ester linkages, further enhancing the functionality of sustainable materials.

Career Highlights

Throughout his career, Penhale has worked with esteemed organizations such as SRI International and Pharmaceutical Delivery Systems, Inc. His innovative work has positioned him as a leader in the development of biodegradable materials, contributing to advancements in environmental sustainability.

Collaborations

Some of his notable coworkers include Jorge Heller and Steve Y. Ng. Their collaborative efforts have further propelled the research and development of biodegradable polymers.

Conclusion

Donald W. Penhale's contributions to the field of biodegradable polymers exemplify his commitment to innovation and sustainability. His patents and collaborations reflect a dedication to creating environmentally friendly solutions that benefit various industries.

Profile summary based on public USPTO records.
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]
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