For the Inventor, By the Inventor

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Folsom, CA, United States of America

C & K Systems, Inc.

USPTO Granted Patents = 31

Trademarks = 3

Forward Citations = 763

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25 inventors (with patents filed for the assignee):

Donald R Sandell (4 out of 86 patents)

Stephen A Rickman (4 out of 4 patents)

Gordon S Whiting (4 out of 4 patents)

4. Paul M Hoseit (4 out of 17 patents)

5. Frederick W Eggers (4 out of 4 patents)

6. Richard A Johnson (3 out of 4 patents)

7. John D Wallace (2 out of 3 patents)

8. Joseph R Perkins (2 out of 3 patents)

9. Dennis R Mueller (2 out of 2 patents)

10. David Houston (2 out of 2 patents)

11. Lawrence R Tracy (2 out of 4 patents)

12. Jack L Biersdorff (2 out of 2 patents)

13. Tom R Petek (1 out of 4 patents)

14. David I McKenney (1 out of 2 patents)

15. Ali R Mousavi (1 out of 1 patent)

31 patents: Sort by Forward Citations

1. 6121876 - System for absorbing and or scattering superfluous radiation in an (2000-09-19),

2. 5969506 - Apparatus and method for rapid bulk charging of a lead acid battery (1999-10-19),

3. 5818337 - Masked passive infrared intrusion detection device and method of (1998-10-06),

4. 5581236 - Methods and apparatus for intrusion detection having improved immunity (1996-12-03),

5. 5578988 - Intrusion detection system having self-adjusting threshold (1996-11-26),

6. 5524099 - Intrusion detector operating mode selection system (1996-06-04),

7. 5499012 - Intrusion detector test circuit which automatically disables a (1996-03-12),

8. 5491467 - Location independent intrusion detection system (1996-02-13),

9. 5475365 - Methods and apparatus for intrusion detection having improved immunity (1995-12-12),

10. 5473311 - Method and apparatus to distinguish human intruder and animal intruder (1995-12-05),

11. 5471195 - Direction-sensing acoustic glass break detecting system (1995-11-28),

12. 5438869 - Protective reed switch housing (1995-08-08),

13. 5395263 - Dual battery holder (1995-03-07),

14. D354925 - Infra-red intruder detector (1995-01-31),

15. 5377049 - Method of making a segmented focusing mirror (1994-12-27),

C & K Systems, Inc. is a leading provider of innovative security solutions. With over 20 years of experience, we specialize in access control systems, surveillance systems, and integrated security solutions. Our team of experts design, install, and maintain tailor-made security solutions for commercial, industrial, and government clients. We strive to ensure the safety and security of our clients' premises and assets, offering cutting-edge technology, reliable systems, and exceptional customer service.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 23 2025

31 Patents

#1 in Folsom, CA

#2,528 in California

#10,550 in US

#20,624 in the World

Folsom, CA, United States of America

C & K Systems, Inc.

Forward Citations = 763

25 inventors:

Donald R Sandell (4 out of 86 patents)

Stephen A Rickman (4 out of 4 patents)

Gordon S Whiting (4 out of 4 patents)

4. Paul M Hoseit (4 out of 17 patents)

5. Frederick W Eggers (4 out of 4 patents)

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