Company Filing History:

6 out of 47

Dunham-bush

patents

Years Active: 1980-1990

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6 patents (USPTO):Sort by Forward CitationsExplore 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.

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