Radio communication system and a portable wireless terminal

Patent 5128981 Issued on July 7, 1992. Estimated Expiration Date:

May 21, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method and apparatus for detecting a data signal including repeated data words
Patent #: 4312074
Issued on: 01/19/1982
Inventor: Pautler , et al.

Cordless telephone system
Patent #: 4456793
Issued on: 06/26/1984
Inventor: Baker , et al.

Programmable telephone system
Patent #: 4481382
Issued on: 11/06/1984
Inventor: Villa-Real

Wireless phone system communicatively combined with a computer
Patent #: 4661659
Issued on: 04/28/1987
Inventor: Nishimura

Private cellular system
Patent #: 4771448
Issued on: 09/13/1988
Inventor: Koohgoli , et al.

Communication control system capable of searching a called telephone set in a mobile radio telephone network
Patent #: 4843622
Issued on: 06/27/1989
Inventor: Yotsutani , et al.

Radio telephone system
Patent #: 4852148
Issued on: 07/25/1989
Inventor: Shibata , et al.

Cordless phone data logger
Patent #: 4914686
Issued on: 04/03/1990
Inventor: Hagar, III, et al.

Portable hybrid communication system and methods
Patent #: 4972457
Issued on: 11/20/1990
Inventor: O'Sullivan

Telecommunication combination comprising a telepoint and a portable radio terminal Patent #: 4980907
Issued on: 12/25/1990
Inventor: Raith, et al.

Inventors

Assignee

Hitachi, Ltd.

Application

No. 526246 filed on 05/21/1990

US Classes:

455/450, Channel allocation455/567Call alerting

Examiners

Primary: Dwyer, James L.
Assistant: Cumming, William

Attorney, Agent or Firm

Fay, Sharpe, Beall, Fagan, Minnich & McKee

Foreign Patent References

0344989 EP 12/12/1989
62-143171 JP. 06/12/1987
0001226 JP 03/12/1989
86/00775 WO 01/12/1986

International Class

H04M 011/00

Foreign Application Priority Data

1989-05-24 JP

Abstract

This invention proposes a radio communication system including a plurality of radio terminals, a relay apparatus (including a plurality of base stations and an exchange station) connected to each radio terminal so that the radio terminals can interchange information from each other, and a data processing unit connected to the relay apparatus, each radio terminal having a circuit for inputting and outputting a voice signal and a circuit for inputting and outputting data whereby it can communicate with another radio terminals or with the data processing unit through the relay apparatus. The radio terminal of this invention further has a clock, and a circuit for storing a schedule inputted by the user thereby to automatically select a receiving mode such as a ringing mode or a nonringing mode in accordance with the contents of the schedule, the present time and so on.

Other References

Akio Sasaki et al., "System Configuration of Multi-Zone Cordless Telephone", NIT Electrical Communications Laboratories, The Institute of Electronics and Communication Engineers of Japan 1986 All Japan Meeting, No. 438, pp. 2-256. Provided in Japanese. An English translation is unavailable to applicants' attorney
Cardona, Heim and Turriere "Digital Data Transmission System for Fixed and Mobile Subscribers", Electrical Communication vol. 52, #3, 197