Battery deterioration indicator for an electronic desk top calculator

Patent 4203103 Issued on May 13, 1980. Estimated Expiration Date:

March 30, 1998. 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

3898790

Low battery voltage indicator for a portable digital electronic instrument
Patent #: 4010456
Issued on: 03/01/1977
Inventor: Erni

Plural comparator indicator of battery voltage
Patent #: 4020414
Issued on: 04/26/1977
Inventor: Paredes

Detecting device for detecting battery outlet voltage
Patent #: 4024415
Issued on: 05/17/1977
Inventor: Matsuura

Electronic timepiece battery potential detecting circuitry
Patent #: 4037399
Issued on: 07/26/1977
Inventor: Chihara

Battery condition monitoring method and apparatus
Patent #: 4052717
Issued on: 10/04/1977
Inventor: Arnold , et al.

Electronic timepiece with battery life display Patent #: 4074515
Issued on: 02/21/1978
Inventor: Asano

Inventors

Assignee

Tokyo Shibaura Electric Co., Ltd. (JP)

Application

No. 05/891741 filed on 03/30/1978

US Classes:

345/38, Liquid crystal display segments340/636.15, By voltage340/636.19, Battery deterioration detection340/691.3Degree or urgency

Examiners

Primary: Curtis, Marshall M.

Attorney, Agent or Firm

Finnegan, Henderson, Farabow, Garrett & Dunner

International Class

G06F 1/28 (20060101)

Foreign Application Priority Data

1977-03-30 JP

Abstract

A battery deterioration indicator has a plurality of indication regions indicating a battery life when a battery voltage falls to a voltage corresponding to a predetermined different voltage level. The indicator is capable of detecting the drop of the battery voltage which shows the battery deterioration and indicating in turn the deteriorating degrees of the battery in the order of from a smaller degree of deterioration to a larger. Accordingly, users may know the battery deterioration by seeing signs indicated on the indicator long enough before the battery life runs out to secure a replacement and at the same time may know how long the remaining battery life will last.