Donald P. Martin

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Chicago, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Descender printing system for dot matrix printer
- Patent number 4,037,705
- Issue date Jul 26, 1977
- Extel Corporation
- Donald P. Martin
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for multiple speed print rate control for dot...
- Patent number 3,990,559
- Issue date Nov 9, 1976
- Extel Corporation
- Donald P. Martin
- G06 - COMPUTING CALCULATING COUNTING