Gary Grantland

Person

Huntsville, AL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Coin validation apparatus
- Patent number 6,223,877
- Issue date May 1, 2001
- QVEX, Inc.
- Joseph R. McGinty
- G07 - CHECKING-DEVICES
Information Patent Grant
Full coin box signalling device for use with coin telephones
- Patent number 5,737,401
- Issue date Apr 7, 1998
- Quadrum Telecommunications, Inc.
- Gary Grantland
- G07 - CHECKING-DEVICES
Information Patent Grant
Electronic circuit for telephone paystation coin operated trigger
- Patent number 5,084,613
- Issue date Jan 28, 1992
- Quadrum Telecommunications, Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic trigger for prepay type telephone paystations
- Patent number 4,988,860
- Issue date Jan 29, 1991
- Palco Telecom Inc.
- William M. Wollet
- G07 - CHECKING-DEVICES
Information Patent Grant
Low voltage operated coin relay
- Patent number 4,903,294
- Issue date Feb 20, 1990
- Palco Telecom Inc.
- Gary Grantland
- G07 - CHECKING-DEVICES
Information Patent Grant
Paystation monitor circuit to prevent fraudulent use
- Patent number 4,896,348
- Issue date Jan 23, 1990
- Palco Telecom Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Adaptive telephone receive control
- Patent number 4,831,650
- Issue date May 16, 1989
- Palco Telecom, Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Paystation transmitter ground detect circuitry
- Patent number 4,821,313
- Issue date Apr 11, 1989
- Palco Telecom Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Latching relay hold release circuit for a telephone instrument
- Patent number 4,454,385
- Issue date Jun 12, 1984
- GTE Automatic Electric Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic hold release circuit
- Patent number 4,447,674
- Issue date May 8, 1984
- GTE Automatic Electric Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic common switch having an improved receiver mating arrange...
- Patent number 4,442,322
- Issue date Apr 10, 1984
- GTE Automatic Electric Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic hold circuit
- Patent number 4,440,981
- Issue date Apr 3, 1984
- GTE Automatic Electric Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Latching relay hold circuit for a telephone instrument
- Patent number 4,435,622
- Issue date Mar 6, 1984
- GTE Automatic Electric Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Loudspeaking substation circuit
- Patent number 4,309,573
- Issue date Jan 5, 1982
- GTE Automatic Electric Labs Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Gary Grantland

Person

Patents Grantslast 30 patents

Coin validation apparatus

Full coin box signalling device for use with coin telephones

Electronic circuit for telephone paystation coin operated trigger

Electronic trigger for prepay type telephone paystations

Low voltage operated coin relay

Paystation monitor circuit to prevent fraudulent use

Adaptive telephone receive control

Paystation transmitter ground detect circuitry

Latching relay hold release circuit for a telephone instrument

Electronic hold release circuit

Electronic common switch having an improved receiver mating arrange...

Electronic hold circuit

Latching relay hold circuit for a telephone instrument

Loudspeaking substation circuit