This inventor holds 3 USPTO granted patents. Top assignees: Federal Cartridge Company, Federal-Hoffman, Inc. D/b/a Federal Cartridge Co.. Active years: 1992-2001.
Location History:
- Maple Grove, MN (US) (1992 - 1999)
- Rogers, MN (US) (2001)
Company Filing History:
2 out of 44 
1 out of 1 Years Active: 1992-2001
Title: The Innovative Contributions of David C. Longren
Introduction
David C. Longren is a notable inventor based in Maple Grove, MN (US). He has made significant contributions to the field of shotshell technology, holding a total of 3 patents. His work focuses on enhancing the effectiveness and environmental sustainability of shotshell components.
Latest Patents
One of Longren's latest patents is a shotshell that incorporates pellets of different densities arranged in stratified layers. This innovative design allows for increased effectiveness at both close and long ranges. The more dense pellets, preferably made of tungsten, are located at the rear, maintaining a tighter pattern at long distances. In contrast, the pellets of lesser density, typically made of steel, are positioned forward to create a wider pattern, making them more effective at close range. Another significant patent involves the development of injection-modulable, polycaprolactone-based, biodegradable plastic. This nontoxic and biodegradable material is used for injection-molded shotshell components, enhancing their environmental impact while maintaining functionality.
Career Highlights
Throughout his career, David C. Longren has worked with prominent companies in the industry, including Federal Cartridge Company and Federal-Hoffman, Inc., which operates as Federal Cartridge Co. His experience in these organizations has contributed to his expertise in shotshell technology and innovation.
Collaborations
Longren has collaborated with notable individuals in his field, including Robert L. Kramer and Lawrence Peter Head. These partnerships have likely fostered a creative environment that has led to the development of his innovative patents.
Conclusion
David C. Longren's contributions to shotshell technology demonstrate his commitment to innovation and sustainability. His patents reflect a deep understanding of materials and design, positioning him as a significant figure in the field.