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For the Inventor, By the Inventor

Allentown, PA, United States of America

Apd Cryogenics, Inc.


USPTO Granted Patents = 22


Trademarks = 2

Forward Citations = 505

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19 inventors (with patents filed for the assignee):

goldMedal Ralph C Longsworth (17 out of 76 patents)

silverMedal Boris V Yudin (5 out of 7 patents)

bronzeMedal Ajay N Khatri (4 out of 7 patents)

4.  Dennis H Hill (3 out of 5 patents)

5.  Mikhail Boiarski (3 out of 3 patents)

6.  William A Steyert (3 out of 9 patents)

7.  Mikhail Boyarsky (2 out of 3 patents)

8.  Glenn Bonney (1 out of 1 patent)

9.  Larry Klusmier (1 out of 1 patent)

10.  Victor I Mogorychny (1 out of 1 patent)

11.  Richard Stevenson (1 out of 4 patents)

12.  Oleg N Podcherniev (1 out of 2 patents)

13.  Michael Boiarski (1 out of 2 patents)

14.  Mikhail J Boiarsky (1 out of 1 patent)

15.  Francis T Lotz (1 out of 1 patent)


22 patents:

1. 5875651 - Low vibration throttling device for throttle-cycle refrigerators (1999-03-02),
2. 5729993 - Precooled vapor-liquid refrigeration cycle (1998-03-24),
3. 5706663 - High efficiency throttle cryogenic refrigerator based on one stage (1998-01-13),
4. 5687574 - Throttle cycle cryopumping system for Group I gases (1997-11-18),
5. 5628195 - Vibrationally isolated thermal system for a cryogenically cooled device (1997-05-13),
6. 5595065 - Closed cycle cryogenic refrigeration system with automatic variable flow (1997-01-21),
7. 5579654 - Cryostat refrigeration system using mixed refrigerants in a closed vapor (1996-12-03),
8. 5461873 - Means and apparatus for convectively cooling a superconducting magnet (1995-10-31),
9. 5457961 - Crysostat for very stable temperature maintenance (1995-10-17),
10. 5452582 - Cryo-probe (1995-09-26),
11. 5441658 - Cryogenic mixed gas refrigerant for operation within temperature ranges (1995-08-15),
12. 5425890 - Substitute refrigerant for dichlorodifluoromethane refrigeration systems (1995-06-20),
13. 5402648 - Sealed dewar with separate circulation loop for external cooling at (1995-04-04),
14. 5385027 - Continuous flow cryogen sublimation cooler (1995-01-31),
15. 5337572 - Cryogenic refrigerator with single stage compressor (1994-08-16),
Company Overview
Apd Cryogenics, Inc. is a specialized manufacturer based in Allentown, Pennsylvania, focusing on advanced cryogenic systems and components. The company is dedicated to the development of innovative solutions that cater to various industries, including aerospace, medical, and research sectors. With a strong emphasis on precision engineering and cutting-edge technology, Apd Cryogenics plays a crucial role in enhancing the performance and efficiency of cryogenic applications, contributing to advancements in scientific research and industrial processes.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

22 Patents

#11 in Allentown, PA

#550 in Pennsylvania

#15,037 in US

#28,782 in the World

Allentown, PA (US)
Allentown, PA, United States of America

Apd Cryogenics, Inc.

Forward Citations = 505

19 inventors:

goldMedal Ralph C Longsworth (17 out of 76 patents)

silverMedal Boris V Yudin (5 out of 7 patents)

bronzeMedal Ajay N Khatri (4 out of 7 patents)

4.  Dennis H Hill (3 out of 5 patents)

5.  Mikhail Boiarski (3 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Apd Cryogenics, Inc.. Retrieved from https://idiyas.com/company/apd-cryogenics

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

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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