Telephone instruments patents

Telephone instruments

Filed: April 7th, 1977 [Granted]

Patent Number: 4107481

... 1978 [54] TELEPHONE INSTRUMENTS [75] Inventor: Digby Redshaw, Warwick, England [73] Assignee: The Post Office, London, England [21] Appl. No.

TELEPHONE INSTRUMENTS

Filed: August 11th, 1960 [Granted]

Assignee: Telefcnaktiebolaget L M Ericsson

Patent Number: 3133163

May 12, 1964 Filed Aug. 11, I960 POR PERSSON ETAL TELEPHONE INSTRUMENTS 3133163 4 Sheets-Sheet 1 ...

TELEPHONE INSTRUMENTS

Filed: November 30th, 1960 [Granted]

Patent Number: 3165597

Jan. 12, 1965 oer nordstrOm etal 3165597 TELEPHONE INSTRUMENTS Filed Nov. 30, 1960 3 Sheets-Sheet 1 ...

TELEPHONE INSTRUMENTS

Filed: October 26th, 1961 [Granted]

Patent Number: 3179751

April 20, 1965 AE HARROLD TELEPHONE INSTRUMENTS Filed Oct. 26, 1961 3179751 ...

TELEPHONE INSTRUMENTS

Filed: March 1st, 1971 [Granted]

Patent Number: 3686444

22, 1972 [ 54] TELEPHONE INSTRUMENTS [72] Inventor: Robert Andrew Stevenson, 34 Haukshead Place, Newton Aycliffe, England [22] Filed: March 1, ...

Locking device for telephone instrument

Filed: March 11th, 1980 [Granted]

Patent Number: 4398067

1 LOCKING DEVICE FOR TELEPHONE INSTRUMENT BACKGROUND OF THE INVENTION The present invention relates in general to locking devices for telephone instruments, ...

Telephone instrument

Filed: January 23rd, 1987 [Granted]

Assignee: Telenorma Telefonbau und Normalzeit GmbH

Patent Number: 4790007

TELEPHONE INSTRUMENT BACKGROUND OF THE INVENTION 1. Field of the Invention The invention concerns a telephone instrument (ie, a telephone set) with a ...

Security device for a telephone instrument

Filed: June 13th, 1988 [Granted]

Patent Number: 4937860

SECURITY DEVICE FOR A TELEPHONE INSTRUMENT FIELD OF THE INVENTION 5 The present invention relates to a security device adapted for use with telephone ...