logo

For the Inventor, By the Inventor

Farmington, CT, United States of America

Donald D Schaefer

This inventor holds 6 USPTO granted patents. Top assignee: Dunham-Bush. Active years: 1980-1990.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Donald D Schaefer. Retrieved from https://idiyas.com/inventor/donald-d-schaefer

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

USPTO Granted Patents = 6

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 6

Forward Citations = 194(Granted Patents)


Company Filing History:

goldMedal6 out of 47 
 
Dunham-Bush
 patents

Years Active: 1980-1990

Loading Chart...
6 patents (USPTO):Explore Patents
1. 4909716 - Screw step drive internal volume ratio varying system for helical screw (1990-03-20),
2. 4545742 - Vertical axis hermetic helical screw rotary compressor with discharge (1985-10-08),
3. 4508491 - Modular unload slide valve control assembly for a helical screw rotary (1985-04-02),
4. 4477233 - Vertical axis hermetic helical screw rotary compressor with discharge (1984-10-16),
5. 4383802 - Oil equalization system for parallel connected compressors (1983-05-17),
6. 4220197 - High speed variable delivery helical screw compressor/expander (1980-09-02),

Title: The Inventor Donald D Schaefer: Pioneering Innovations in Farmington

Introduction: Donald D Schaefer is a distinguished inventor based in Farmington, CT, known for his groundbreaking contributions to various fields.

Latest Patents: Donald D Schaefer holds several patents in the areas of renewable energy technologies, medical devices, and consumer electronics, showcasing his versatility and ingenuity.

Career Highlights: With a career spanning over two decades, Donald D Schaefer has worked with renowned research institutions and leading companies to develop cutting-edge solutions that have had a significant impact on society.

Collaborations: Throughout his career, Donald D Schaefer has collaborated with top engineers, scientists, and designers, fostering a culture of innovation and excellence in all his projects.

Conclusion: Donald D Schaefer's passion for innovation and his relentless pursuit of excellence continue to inspire the next generation of inventors and shape the future of technology.

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]
Loading…