Patent US3564837A successfully refreshed from Google Patents.
US3564837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency divider for an electronic watch
Assignee: Timex Group USA Inc
•
Filing: 1969-02-05
•
Granted: 1971-02-23
•
Expires: 1989-02-05
Abstract
Abstract A HOROLOGICAL INSTRUMENT INCLUDES AN ELECTRIC CIRCUIT WHICH COUNTS DOWN FROM A HIGH-FREQUENCY TIME BASE, SUCH AS A CRYSTAL OSCILLATOR. THE COUNT-DOWN CIRCUIT INCLUDES AT LEAST THREE SUBCIRCUITS HAVING TIME PERIODS WHICH ARE RELATIVELY PRIME INTEGERS OF EACH OTHER, AND AN "AND" CIRCUIT.
Inventors
- 👤 Eugene R Keeler
- 👤 Lewis B Shrady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:27
CPC Classifications
G; G04; G04G; G04G3/00; G04G3/02; G04G3/027; H; H03; H03B; H03B21/00; H03B21/01; H03B21/02; H03B21/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |