Philip A. Keefer

Person

Waseca, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Priority system for a wide area transmission trunked communication...
- Patent number 5,815,799
- Issue date Sep 29, 1998
- E.F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for a distributive wide area network for a lan...
- Patent number 5,613,196
- Issue date Mar 18, 1997
- E. F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for a remote network switch for a land mobile...
- Patent number 5,548,802
- Issue date Aug 20, 1996
- E.F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Signaling protocol for a distributive wide area transmission trunke...
- Patent number 5,465,386
- Issue date Nov 7, 1995
- E. F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Modular networking switch system for a distributive wide area trans...
- Patent number 5,440,759
- Issue date Aug 8, 1995
- E.F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for a distributive wide area network for a lan...
- Patent number 5,159,701
- Issue date Oct 27, 1992
- E. F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for an alternate home channel for a land mobil...
- Patent number 5,040,237
- Issue date Aug 13, 1991
- E. F. Johnson Company
- Keith W. Barnes
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Philip A. Keefer

Person

Patents Grantslast 30 patents

Priority system for a wide area transmission trunked communication...

Method and apparatus for a distributive wide area network for a lan...

Method and apparatus for a remote network switch for a land mobile...

Signaling protocol for a distributive wide area transmission trunke...

Modular networking switch system for a distributive wide area trans...

Method and apparatus for a distributive wide area network for a lan...

Method and apparatus for an alternate home channel for a land mobil...