John J. Duffy

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Glenside, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Coin slide with magnetic slug attracting means
- Patent number 5,220,988
- Issue date Jun 22, 1993
- Equipment Systems & Devices, Inc.
- Evan C. Wilfong
- G07 - CHECKING-DEVICES
Information Patent Grant
Coin slide with coin drop delay means
- Patent number 4,499,983
- Issue date Feb 19, 1985
- Harvey S. Gitlin
- G07 - CHECKING-DEVICES
Information Patent Grant
Coin slide with interchangeable cores
- Patent number 4,401,202
- Issue date Aug 30, 1983
- Equipment Systems & Devices, Inc.
- Harvey S. Gitlin
- G07 - CHECKING-DEVICES
Information Patent Grant
Coin slide with interchangeable cores
- Patent number 4,350,240
- Issue date Sep 21, 1982
- Equipment Systems & Devices, Inc.
- Harvey S. Gitlin
- G07 - CHECKING-DEVICES