U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Portable computer/radio power management system

Patent 5638540 Issued on June 10, 1997. Estimated Expiration Date: Icon_subject February 2, 2015. 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.

Patent References

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Patent #: 4614880
Issued on: 09/30/1986
Inventor: Go ,   et al.

Portable computer
Patent #: 4667299
Issued on: 05/19/1987
Inventor: Dunn

Isolated power supply system and method
Patent #: 4694237
Issued on: 09/15/1987
Inventor: Hanson

Device for indicating the charge status of a battery
Patent #: 4775827
Issued on: 10/04/1988
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Electrical energy enhancement apparatus
Patent #: 4785228
Issued on: 11/15/1988
Inventor: Goddard

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Inventor

Assignee

Application

No. 384357 filed on 02/02/1995

US Classes:

713/300, COMPUTER POWER CONTROL713/321Programmable calculator with power saving feature

Examiners

Primary: Harvey, Jack B.
Assistant: Myers, Paul R.

Attorney, Agent or Firm

Foreign Patent References

  • 6317918 JP. 02/12/1989
  • 6312365 JP 07/12/1989

International Class

G06F 017/00

Abstract

An electrical power management system for supplying power to a computer peripheral having a relatively high intermittent power demand, such as a packet-switched data radio. A first self-contained rechargeable power supply, outputting power appropriate for the electrical appliance, stores electrical energy and supplies power to the appliance. A second self-contained rechargeable power supply stores electrical energy and supplies electrical power to intermittently recharge the first power supply. The first and the second power supplies can be such self-contained units as single or multicell batteries or capacitors. Preferably, the first power supply is a battery or a capacitor and the second power source is an internal power supply of a portable personal computer.

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