Ralph C Longsworth

This inventor holds 76 USPTO granted patents and 4 published patent applications, plus 2 CIPO patents and 7 EPO patents, primarily in Cryogenic Technology (CPC class F25B). Top assignees: Apd Cryogenics, Inc., Sumitomo (Shi) Cryogenics of America, Inc., Air Products and Chemicals, Inc.. Active years: 1979-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ralph C Longsworth. Retrieved from https://idiyas.com/inventor/ralph-c-longsworth

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

USPTO Granted Patents = 76 (Patent Applications = 4)

% Patents Active = 88.2

CIPO Patents = 2 (Patent Applications = 7)

EPO Patents = 7 (Patent Applications = 9)

Average Co-Inventor Count = 1.4

ph-index = 15

Forward Citations = 880(Granted Patents)

Forward Citations (Not Self Cited) = 771(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Allentown, PA (US) (1979 - 2022)
Mount Desert, ME (US) (2023 - 2024)

Company Filing History:

Sumitomo (Shi) Cryogenics of America, Inc.

patents

16 out of 3,219

Air Products and Chemicals, Inc.

patents

4. 11 out of 12

Sumitomo (Shi) Cryogenic of America, Inc.

patents

5. 10 out of 18

Shi-Apd Cryogenics, Inc.

patents

6. 9 out of 1,251

Sumitomo Heavy Industries, Ltd.

patents

7. 2 out of 19

Intermagnetics General Corporation

Shi-Apd Cryogencis, Inc.

patent

10. 1 out of 834,513

Other

patents

where one patent can have more than one assignee

Years Active: 1979-2026

Loading Chart...

Areas of Expertise:

Cryogenic Expansion Engine

Helium Compressor

Pulse Tube Refrigerator

Brayton Cycle Engine

Cryopump

Cooling Methods

Gas Balanced Engine

Magnetic Shield

Low Vibration

Fast Cool Down

Reversible Pneumatic Drive

Hybrid Expander

76 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12760940 - Dual helium compressors (2026-10-13),

2. 12753954 - Hybrid double-inlet valve for pulse tube cryocooler (2026-10-06),

3. 12638220 - Gas energized seal for Gifford-McMahon expander (2026-05-26),

4. 12018780 - Split pulse tube connecting line (2024-06-25),

5. 11662123 - Reversible pneumatic drive expander (2023-05-30),

6. 11649989 - Heat station for cooling a circulating cryogen (2023-05-16),

7. 11604010 - Co-axtal, double-inlet valve for pulse tube cryocooler (2023-03-14),

8. RE49384 - Helium compressor with dual after-coolers (2023-01-23),

9. 11215385 - Hybrid Gifford-McMahon-Brayton expander (2022-01-04),

10. 11149992 - Dual helium compressors (2021-10-19),

11. 11137181 - Gas balanced engine with buffer (2021-10-05),

12. 10794616 - Hybrid Brayton—Gifford-McMahon expander (2020-10-06),

13. 10753653 - Heat station for cooling a circulating cryogen (2020-08-25),

14. 10704809 - System for warming-up and cooling-down a superconducting magnet (2020-07-07),

15. 10677498 - Brayton cycle engine with high displacement rate and low vibration (2020-06-09),

Title: The Innovative Journey of Ralph C Longsworth

Introduction: Ralph C Longsworth, a pioneering inventor hailing from Allentown, PA (US), has made significant contributions to the world of innovations with his creative mindset and dedication to progress.

Latest Patents: Ralph C Longsworth's latest patents showcase his commitment to pushing boundaries in various industries, including technology, healthcare, and sustainability. His recent inventions focus on enhancing efficiency and improving everyday life for people around the globe.

Career Highlights: Throughout his illustrious career, Ralph C Longsworth has been recognized for his groundbreaking inventions that have revolutionized the way we live and work. His innovative spirit has led to the development of cutting-edge technologies that have had a lasting impact on society.

Collaborations: Ralph C Longsworth has collaborated with leading experts in the field to bring his inventions to life. His partnerships with top researchers, engineers, and scientists have been instrumental in turning his visionary ideas into reality.

Conclusion: Ralph C Longsworth's remarkable journey as an inventor exemplifies the power of creativity and perseverance in driving meaningful change. His legacy will continue to inspire future generations to push the boundaries of innovation and create a better world for all.

Profile summary based on public USPTO records.