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Seymour, CT, United States of America

Summagraphics Corporation

Calculating rank

USPTO Granted Patents = 68

CIPO Patents = 1

Forward Citations = 1,645

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42 inventors (with patents filed for the assignee):

Alexander M Purcell (12 out of 12 patents)

Thomas C Zalenski (10 out of 10 patents)

Robert M McDermott (7 out of 8 patents)

4. Charles D Zinsmeyer (5 out of 7 patents)

5. David A Siefer (5 out of 7 patents)

6. James A Parnell (4 out of 9 patents)

7. Michael J Padula (4 out of 4 patents)

8. Wayne J Murray (4 out of 4 patents)

9. Jamie L Barbetti (4 out of 5 patents)

10. John C Venthem (4 out of 5 patents)

11. Henry G Matthews (4 out of 4 patents)

12. Daniel A Ferrara (3 out of 49 patents)

13. Daniel G Lasley (3 out of 3 patents)

14. Albert L Whetstone (3 out of 6 patents)

15. William Valls (3 out of 8 patents)

Core Competencies:

Digitizer Tablet

Stylus

Position Determination

Calibration

Pressure Sensitive

Optical System

Graphics Tablet

Electro-Optical Mouse

Liquid Crystal Shutter

Low Power Sensing

Digital Tablet System

Magnetostrictive Transducers

68 patents: Sort by Forward Citations

1. 5581052 - Pressure sensitive stylus having resiliently compressible tip element (1996-12-03),

2. D358601 - Ribbon cassette for a printer (1995-05-23),

3. 5416280 - Digitizer tablet using relative phase detection (1995-05-16),

4. 5405205 - Sheet medium transport system, particularly for printers and plotters (1995-04-11),

5. 5383733 - Ribbon cassette for a printer (1995-01-24),

6. 5369227 - Stylus switch status determination in a digitizer tablet having a (1994-11-29),

7. 5333005 - Apparatus for raising and lowering plotter marking devices (1994-07-26),

8. 5316523 - Sprocket control apparatus (1994-05-31),

9. 5303624 - Apparatus for cutting sheet media (1994-04-19),

10. 5280309 - Single degree of freedom belt drive tensioning system for a plotter (1994-01-18),

11. 5267802 - Ribbon cassette storage and transfer apparatus for a printer (1993-12-07),

12. 5267401 - Method and apparatus for gauging reel diameters in a reel-to-reel sheet (1993-12-07),

13. 5229551 - Hysteresis compensation for a digitizer tablet (1993-07-20),

14. 5214448 - Belt-drive tensioning system which uses a pivoting member (1993-05-25),

15. 5210380 - Digitizer with serpentine-type conductor grid having uniform conductor (1993-05-11),

Company Overview

Summagraphics Corporation, based in Seymour, Connecticut, specializes in advanced digitizer technology, focusing on the development and manufacturing of digitizer tablets and stylus systems. The company is recognized for its innovations in position determination and calibration, enabling precise input for various applications. Their core technologies include pressure-sensitive devices, optical systems, graphics tablets, and electro-optical mice, catering to industries that require high accuracy and responsiveness in digital input solutions.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Nov 3 2026

68 Patents

#1 in Seymour, CT

#148 in Connecticut

#5,383 in US

#10,895 in the World

Seymour, CT, United States of America

Summagraphics Corporation

Forward Citations = 1,645

42 inventors:

Alexander M Purcell (12 out of 12 patents)

Thomas C Zalenski (10 out of 10 patents)

Robert M McDermott (7 out of 8 patents)

4. Charles D Zinsmeyer (5 out of 7 patents)

5. David A Siefer (5 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Summagraphics Corporation. Retrieved from https://idiyas.com/company/summagraphics

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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