LaCrescent, MN, United States of America

Donald S Fiegen

This inventor holds 1 USPTO granted patent. Top assignee: The Trane Company. Active years: 1985.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Donald S Fiegen. Retrieved from https://idiyas.com/inventor/donald-s-fiegen

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

Calculating rank

% Patents Active = 100.0

Average Co-Inventor Count = 2.0

ph-index = 1

Forward Citations = 10(Granted Patents)


Company Filing History:


Years Active: 1985

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1 patent (USPTO):Explore Patents

Title: The Innovative Contributions of Donald S. Fiegen

Introduction

Donald S. Fiegen is a notable inventor based in LaCrescent, MN (US). He has made significant contributions to the field of heat exchanger technology. His innovative approach has led to the development of a unique method that enhances the efficiency and reliability of heat exchangers.

Latest Patents

Fiegen holds a patent for a "Method for pre-expanding heat exchanger tube." This invention involves a method for pre-expanding a heat exchanger tube prior to its insertion into a tube sheet. A tubular mandrel with an elastic bladder sheath is inserted into the tube, allowing for precise expansion. The process minimizes the risk of cracking during installation, ensuring the integrity of the heat exchanger.

Career Highlights

Fiegen is associated with The Trane Company, where he applies his expertise in heat exchanger technology. His work has contributed to advancements in the efficiency of heating and cooling systems. His innovative methods have been recognized for their practical applications in the industry.

Collaborations

Fiegen has collaborated with Chester D. Ware, further enhancing the development of innovative solutions in the field. Their combined efforts have led to improvements in heat exchanger designs and applications.

Conclusion

Donald S. Fiegen's contributions to heat exchanger technology exemplify the impact of innovation in engineering. His patented method for pre-expanding heat exchanger tubes showcases his commitment to enhancing efficiency and reliability in the industry.

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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