Peter J Piotrowski

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Chicago, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of displaying video images projected from a video display of...
- Patent number 6,129,353
- Issue date Oct 10, 2000
- Williams Electronics Games, Inc.
- Lawrence E. DeMar
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Lock-down bar release system for a pinball machine
- Patent number 6,120,021
- Issue date Sep 19, 2000
- Williams Electronics Games, Inc.
- Peter J. Piotrowski
- G07 - CHECKING-DEVICES
Information Patent Grant
Jump rope play feature for a pinball game
- Patent number 5,915,693
- Issue date Jun 29, 1999
- Peter J Piotrowski
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Multimode target with variable trajectory ball ramp
- Patent number 5,913,516
- Issue date Jun 22, 1999
- Peter J Piotrowski
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Jet bumper for a pinball game
- Patent number 5,697,612
- Issue date Dec 16, 1997
- Williams Electronics Games, Inc.
- Peter J. Piotrowski
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Game playfield mounting system
- Patent number 5,536,082
- Issue date Jul 16, 1996
- Williams Electronics Games, Inc.
- Steve Ritchie
- A63 - SPORTS GAMES AMUSEMENTS