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For the Inventor, By the Inventor

Columbus, OH, United States of America

Ranco Inc.


USPTO Granted Patents = 59

% Expired Patents = 1.7

Trademarks = 5

Forward Citations = 788

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54 inventors (with patents filed for the assignee):

goldMedal Guglielmo Rossi (13 out of 14 patents)

silverMedal Gunter Piesche (4 out of 5 patents)

bronzeMedal Roland B Caldwell (3 out of 3 patents)

4.  Russell G Attridge, Jr (3 out of 3 patents)

5.  Merlin E Demaray (3 out of 3 patents)

6.  Robert F Purssell (3 out of 4 patents)

7.  Pandu R Cholkeri (3 out of 6 patents)

8.  William D Kramer (2 out of 8 patents)

9.  Brian Enderle (2 out of 3 patents)

10.  William Peter Tanguay (2 out of 17 patents)

11.  Lee A White (2 out of 3 patents)

12.  William J Houk (2 out of 2 patents)

13.  Themistocles H Gliatas (2 out of 2 patents)

14.  Vincenzo Ferloni (2 out of 2 patents)

15.  Mario Gemma (2 out of 3 patents)


Core Competencies:
Temperature Sensing
Refrigerant Flow
Pressure Regulation
Control Systems
Snap Action Switch
Heating System
Cooling System
Alarm Synchronization
Fluid Flow Control
Turbocharger Control
EGR Control
Diagnostic Devices

59 patents:

1. 6862589 - System and method for performing diagnostics using a portable device displaying diagnostic data using templates (2005-03-01),
2. 6751978 - Transition fitting (2004-06-22),
3. 6614347 - Apparatus and method for providing alarm synchronization among multiple alarm devices (2003-09-02),
4. 6378328 - Blow-off orifice tube (2002-04-30),
5. 6374624 - On/off solenoid expansion device (2002-04-23),
6. 6367283 - Three-stage electronically variable orifice tube (2002-04-09),
7. 5966078 - Battery saving circuit for a dangerous condition warning device (1999-10-12),
8. 4882908 - Demand defrost control method and apparatus (1989-11-28),
9. 4881057 - Temperature sensing apparatus and method of making same (1989-11-14),
10. 4800292 - Temperature sensing circuit (1989-01-24),
11. 4745385 - Switching relays (1988-05-17),
12. 4737604 - Three stage pressure switch (1988-04-12),
13. 4721937 - Temperature responsive switch (1988-01-26),
14. 4712582 - Reversing valve assembly with improved pilot valve mounting structure (1987-12-15),
15. 4703625 - Turbocharger control system (1987-11-03),
Company Overview
Ranco Inc., headquartered in Columbus, OH, specializes in the development and manufacturing of advanced temperature control systems. The company focuses on critical technology areas such as temperature sensing, refrigerant flow management, and pressure regulation. Ranco's expertise extends to control systems, snap action switches, and both heating and cooling systems, ensuring efficient temperature management across various applications. Their innovative solutions are designed to enhance performance and reliability in temperature-sensitive environments.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

59 Patents

#15 in Columbus, OH

#270 in Ohio

#6,069 in US

#12,226 in the World

Columbus, OH (US)
Columbus, OH, United States of America

Ranco Inc.

Forward Citations = 788

54 inventors:

goldMedal Guglielmo Rossi (13 out of 14 patents)

silverMedal Gunter Piesche (4 out of 5 patents)

bronzeMedal Roland B Caldwell (3 out of 3 patents)

4.  Russell G Attridge, Jr (3 out of 3 patents)

5.  Merlin E Demaray (3 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Ranco Inc.. Retrieved from https://idiyas.com/company/ranco

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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