Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1989-07-11
1991-04-02
Eisenzopf, Reinhard J.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 61, 379 62, 379 63, 455127, 455343, H04M 1100
Patent
active
050051989
ABSTRACT:
A cordless telephone includes a portable unit having chargeable secondary batteries as a power source in which to minimize the power consumption, signals are received intermittently to limit the operating time of the built-in receiver. The portable unit includes a detecting device for detecting the charging state of the secondary battery, and swtiching device for switching the receiving action of receiver to a continuous receiving action while the charging state of the secondary battery is being detected by the battery charging detecting device. Accordingly, the power source of the receiver, while the secondary batteries are being charged is fed from the power source for charging through the secondary batteries. Thus, the receiving action during this period may be set in continuous receiving action. Hence, it is possible to reply from the portable unit without delay to a call from a base unit during the charging.
REFERENCES:
patent: 4375701 (1983-03-01), Hanson
patent: 4562307 (1985-12-01), Bursztejn et al.
patent: 4723304 (1988-02-01), Maeda
patent: 4726052 (1988-02-01), Kato et al.
patent: 4766580 (1988-08-01), Go et al.
patent: 4794649 (1988-12-01), Fujiwara
patent: 4852147 (1989-07-01), Suzuki et al.
European Patent Application 218,482 to Kato et al. Dated 3/10/86.
PCT Published International Aplication No. WO87/02848 to Schaefer et al. Dated May 7, 1987.
Eisenzopf Reinhard J.
Negash Kinfe-Michael
Sharp Kabushiki Kaisha
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