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For the Inventor, By the Inventor

US

Summagraphics Corporation


USPTO Granted Patents = 67


Forward Citations = 1,625

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44 inventors (with patents filed for the assignee):

goldMedal Alexander M Purcell (12 out of 12 patents)

silverMedal Thomas C Zalenski (10 out of 10 patents)

bronzeMedal 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:
Pressure Sensitive Stylus
Digitizer Tablet
Ribbon Cassette
Sheet Medium Transport
Optical Accessory
Dynamic Adjustment
Liquid Crystal Shutter
Graphics Tablet
Position Determining
Electro-Optical Mouse
Hysteresis Compensation
Low Power Sensing

67 patents:

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. 5303624 - Apparatus for cutting sheet media (1994-04-19),
9. 5280309 - Single degree of freedom belt drive tensioning system for a plotter (1994-01-18),
10. 5267802 - Ribbon cassette storage and transfer apparatus for a printer (1993-12-07),
11. 5267401 - Method and apparatus for gauging reel diameters in a reel-to-reel sheet (1993-12-07),
12. 5229551 - Hysteresis compensation for a digitizer tablet (1993-07-20),
13. 5214448 - Belt-drive tensioning system which uses a pivoting member (1993-05-25),
14. 5210380 - Digitizer with serpentine-type conductor grid having uniform conductor (1993-05-11),
15. 5194699 - Digitizer tablet with fixed incremented grid portions (1993-03-16),
Summagraphics Corporation is a leading manufacturer of digitizing tablets and graphics tablets. With over 30 years of experience, Summagraphics offers a wide range of innovative and high-quality products for graphic design, CAD/CAM, and other applications. Their tablets are known for their precision, reliability, and seamless integration with popular software platforms. Visit their website to explore their product portfolio and learn more about how Summagraphics can enhance your digital workflow.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 2 2025

67 Patents

#21 in undefined, undefined

#46 in

#5,216 in US

#10,583 in the World

...
US

Summagraphics Corporation

Forward Citations = 1,625

44 inventors:

goldMedal Alexander M Purcell (12 out of 12 patents)

silverMedal Thomas C Zalenski (10 out of 10 patents)

bronzeMedal 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)

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