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For the Inventor, By the Inventor

Long Island City, NY, United States of America

Propper Manufacturing Co., Ltd.


USPTO Granted Patents = 49

% Expired Patents = 2.0


Trademarks = 23

Forward Citations = 1,429

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24 inventors (with patents filed for the assignee):

goldMedal Helmut A Heine (19 out of 30 patents)

silverMedal Otto H Schmidt (10 out of 20 patents)

bronzeMedal Thomas A Augurt (10 out of 12 patents)

4.  Helmut W Rosenbusch (10 out of 12 patents)

5.  Irving A Speelman (7 out of 7 patents)

6.  John D Dyckman (4 out of 4 patents)

7.  Jan Raczkowski (4 out of 6 patents)

8.  Joseph Nussenbaum (3 out of 5 patents)

9.  Ken Summer (3 out of 3 patents)

10.  Andrew Zwarun (2 out of 2 patents)

11.  Peter Hunsinger (2 out of 2 patents)

12.  Frank E Platko (2 out of 2 patents)

13.  Werner E Erfurt (2 out of 2 patents)

14.  Dennis Kinney (1 out of 1 patent)

15.  Louise Macaro (1 out of 1 patent)


Core Competencies:
Ophthalmoscope
Sterilization Indicator
Steam Sterilizer
Laryngoscope
Endoscope
Sphygmomanometer
Temperature Indicator
Biological Test Device
Optical Examination
Illumination System
Fecal Occult Blood Test
Manual Ophthalmoscope

49 patents:

1. 8262224 - Binocular indirect ophthalmoscope (2012-09-11),
2. 6656429 - Sterilizer vacuum test pack (2003-12-02),
3. 6548248 - DNA sterilization indicator (2003-04-15),
4. 6410336 - Method reagent and kit for the detection of fecal occult blood (2002-06-25),
5. 5563071 - Method, reagent and kit for the detection of fecal occult blood (1996-10-08),
6. 5542905 - Switch mechanism for use in a laryngoscope handle (1996-08-06),
7. 5465124 - Headband with adjustable device for positioning an optical device (1995-11-07),
8. 5447868 - Method, reagent and kit for the detection of fecal occult blood (1995-09-05),
9. 5435971 - Sterilization biological test pack (1995-07-25),
10. 5333018 - Binocular ophthalmoscope (1994-07-26),
11. D347585 - Steam sterilization monitor (1994-06-07),
12. 5217901 - Sterilization biological test pack (1993-06-08),
13. 5200147 - Compact prevacuum steam sterilizer test pack (1993-04-06),
14. 5196964 - Magnifier (1993-03-23),
15. 5158363 - Steam sterilization indicator (1992-10-27),
Company Overview
Propper Manufacturing Co., Ltd. is a prominent player in the medical device industry, specializing in the development and manufacturing of a diverse range of optical examination devices. Based in Long Island City, NY, the company focuses on innovative solutions such as ophthalmoscopes, endoscopes, and laryngoscopes, enhancing diagnostic capabilities in healthcare settings. Additionally, Propper is known for its expertise in sterilization indicators and biological test packs, contributing to the safety and efficacy of medical procedures through advanced steam sterilization technologies.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

49 Patents

#3 in Long Island City, NY

#441 in New York

#7,126 in US

#14,277 in the World

Long Island City, NY (US)
Long Island City, NY, United States of America

Propper Manufacturing Co., Ltd.

Forward Citations = 1,429

24 inventors:

goldMedal Helmut A Heine (19 out of 30 patents)

silverMedal Otto H Schmidt (10 out of 20 patents)

bronzeMedal Thomas A Augurt (10 out of 12 patents)

4.  Helmut W Rosenbusch (10 out of 12 patents)

5.  Irving A Speelman (7 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Propper Manufacturing Co., Ltd.. Retrieved from https://idiyas.com/company/propper-manufacturing-company

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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