Title: Battery deterioration indicator for an electronic desk top calculator

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.

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Inventors: Osada, Kazuhiko (Yokohama, JP)
Ogawa, Yoshishige (Kawasaki, JP)
Takimoto, Ichizo (Yokohama, JP)

Application Number: 891741
Filing Date: 1978-03-30
Publication_date: 1980-05-13
Assignee: Tokyo Shibaura Electric Co., Ltd. (JP)
Primary Class(es): 345/38 340/636.15, 340/636.19, 340/691.3
Other Classes:
US Patent Ref:

3898790	Aug, 1975	Takamune et al.	340/691.
4010456	Mar, 1977	Erni	340/636.
4020414	Apr, 1977	Paredes	340/636.
4024415	May, 1977	Matsuura	340/636.
4037399	Jul, 1977	Chihara	340/636.
4052717	Oct, 1977	Arnold et al.	340/636.
4074515	Feb, 1978	Asano	340/636.

Other Refs:
Primary Examiner: Curtis, Marshall M.
Assistant Examiner:
Attorney: Finnegan, Henderson, Farabow, Garrett & Dunner