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 = 779

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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)

Core Competencies:

Intrusion Detection

Infrared Sensors

Acoustic Detection

Glass Break Sensors

Automated Testing

Lead Acid Battery Charging

Pressure Sensors

Optical Sensing

Vehicle Security

Threshold Adjustment

Human Detection

False Alarm Reduction

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 technology firm based in Folsom, California, specializing in advanced electronic systems and solutions. The company focuses on the development and manufacturing of high-performance products for various sectors, including telecommunications, aerospace, and defense. With a commitment to innovation, C & K Systems leverages cutting-edge research in electronics and systems engineering to deliver reliable and efficient solutions tailored to meet the evolving needs of its clients.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

31 Patents

#1 in Folsom, CA

#2,609 in California

#10,912 in US

#21,217 in the World

Folsom, CA, United States of America

C & K Systems, Inc.

Forward Citations = 779

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)

Please report any incorrect information to [email protected]

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