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For the Inventor, By the Inventor

Grand Rapids, MI, United States of America

Keeler Limited


USPTO Granted Patents = 22

% Expired Patents = 9.1

Trademarks = 7

Forward Citations = 195

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20 inventors (with patents filed for the assignee):

goldMedal James Robert Arnold Matthews (4 out of 4 patents)

silverMedal Mervyn Aubrey Little (4 out of 4 patents)

bronzeMedal Kelvyn Church (3 out of 3 patents)

4.  James R Matthews (3 out of 3 patents)

5.  John Fisher (3 out of 3 patents)

6.  Stephen Church (2 out of 2 patents)

7.  Dale L Flowerday (2 out of 4 patents)

8.  Miner S Keeler, Ii (2 out of 4 patents)

9.  Gerard N Stelma (2 out of 3 patents)

10.  Walter R Deshaw (2 out of 4 patents)

11.  Eugene R Vanarsdale (1 out of 1 patent)

12.  Kenneth R Owen (1 out of 4 patents)

13.  Clive Harrold Thomas Burrows (1 out of 1 patent)

14.  David Ernest Lane Freeman (1 out of 1 patent)

15.  Carl H Little (1 out of 13 patents)


22 patents:

1. 8132915 - Binocular indirect ophthalmoscope (2012-03-13),
2. 7252381 - Ophthamoscope (2007-08-07),
3. 6652100 - Retinoscope with magnetic coupling (2003-11-25),
4. 6280033 - Indirect ophthalmoscope (2001-08-28),
5. 6250761 - Retinoscope (2001-06-26),
6. 6168274 - Ophthalmoscope and attachment therefor (2001-01-02),
7. 6149273 - Ophthalmoscope and image detection means (2000-11-21),
8. 4924867 - Tonometer apparatus (1990-05-15),
9. 4834105 - Calibration method and apparatus for tonometers (1989-05-30),
10. 4724843 - Tonometer (1988-02-16),
11. 4444466 - Universal joint seal and vibration damper for remotely actuated pivotal (1984-04-24),
12. 4341444 - Electrically operated remote control rearview mirror (1982-07-27),
13. 4286841 - Electrically operated remote control rearview mirror (1981-09-01),
14. 4264100 - Automotive sun visor and glare screen (1981-04-28),
15. 4259758 - Method of making a self-tapping screw (1981-04-07),
Company Overview
Keeler Limited is a prominent manufacturer specializing in ophthalmic instruments and devices, catering to the needs of eye care professionals. Based in Grand Rapids, MI, the company focuses on developing innovative solutions that enhance diagnostic accuracy and treatment efficiency in the field of ophthalmology. With a commitment to quality and precision, Keeler Limited plays a vital role in advancing eye care technology, ensuring that practitioners have access to reliable tools for patient care.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

22 Patents

#34 in Grand Rapids, MI

#545 in Michigan

#15,037 in US

#28,782 in the World

Grand Rapids, MI (US)
Grand Rapids, MI, United States of America

Keeler Limited

Forward Citations = 195

20 inventors:

goldMedal James Robert Arnold Matthews (4 out of 4 patents)

silverMedal Mervyn Aubrey Little (4 out of 4 patents)

bronzeMedal Kelvyn Church (3 out of 3 patents)

4.  James R Matthews (3 out of 3 patents)

5.  John Fisher (3 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keeler Limited. Retrieved from https://idiyas.com/company/keeler

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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