Patent US4074515A successfully refreshed from Google Patents.
US4074515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic timepiece with battery life display
Assignee: Seiko Instruments Inc
•
Filing: 1976-07-15
•
Granted: 1978-02-21
•
Expires: 1996-07-15
Abstract
Abstract In a digital electronic timepiece, at least one of the digital displays changes color to indicate that the battery is nearing exhaustion. The display is made up of two sets of display elements, for example LEDs, disposed closely adjacent alongside one another. The two sets are of different display color, eg. red and green. Circuitry responsive to battery voltage causes display elements of one set to be illuminated when the battery voltage is normal and causes display elements of the other set to be illuminated when the battery voltage drops below a predetermined value. The resulting change in color of the display indicates that the battery is approaching the end of its life.
Inventors
- 👤 Kazuhiro Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:45
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/08; G04G9/10; G04C; G04C10/00; G04C10/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
In a digital electronic timepiece the combination of: alphanumerical display means comprising two sets of visual display elements disposed closely adjacent alongside one another, each set of said display elements being of a different display color from the other, battery means for supplying power for illuminating said display means, means for detecting whether the voltage of said battery means is above or below a predetermined value, and switching means controlled by said detecting means for supplying power from said battery means to selected elements of one of said sets when the voltage of said battery means is above said value and to selected elements of the other of said sets when said voltage is below said value.
Claim 2
Dependent Claim
117 words
In a digital electronic timepiece the combination of: alphanumerical display means comprising two sets of visual display elements disposed closely adjacent alongside one another, each set of said display elements being of a different display color from the other, battery means for supplying power for illuminating said display means, means for detecting whether the voltage of said battery means is above or below a predetermined value, and switching means controlled by said detecting means for supplying power from said battery means to selected elements of one of said sets when the voltage of said battery means is above said value and to selected elements of the other of said sets when said voltage is below said value.
Claim 3
Dependent Claim
15 words
A combination according to claim 1, in which said display elements are light emitting diodes.
Claim 4
Dependent Claim
153 words
In a digital electronic timepiece the combination of: oscillatory circuit means for producing an oscillating signal, dividing means for dividing said oscillating signal to produce time signals, counting means for counting said time signals, display means for displaying the count of said counting means, said display means comprising two sets of visual display elements disposed closely adjacent alongside one another, one set of said display elements being of a different display color from the other, battery means for supplying power for said timepiece, means for detecting whether the voltage of said battery means is above or below a predetermined value, and switching means controlled by said detecting means for supplying power from said battery means to selected elements of one of said sets when the voltage of said battery means is above said predetermined value and to selected elements of the other of said sets when said voltage is below said selected value.
Claim 5
Dependent Claim
153 words
In a digital electronic timepiece the combination of: oscillatory circuit means for producing an oscillating signal, dividing means for dividing said oscillating signal to produce time signals, counting means for counting said time signals, display means for displaying the count of said counting means, said display means comprising two sets of visual display elements disposed closely adjacent alongside one another, one set of said display elements being of a different display color from the other, battery means for supplying power for said timepiece, means for detecting whether the voltage of said battery means is above or below a predetermined value, and switching means controlled by said detecting means for supplying power from said battery means to selected elements of one of said sets when the voltage of said battery means is above said predetermined value and to selected elements of the other of said sets when said voltage is below said selected value.
References Cited (Backward Citations)
US3691755A
Cited
US3802182A
Cited
US3962859A
Cited
US3898790A
Cited
US3984973A
Cited
US3991553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |