Patent US1490740A successfully refreshed from Google Patents.
US1490740A
Expired / Lapsed
US
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Relay switch for clock-controlled electric signal devices
Assignee: Individual
•
Filing: 1921-02-15
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Granted: 1924-04-15
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Expires: 1941-02-15
Abstract
No abstract record available.
Inventors
- 👤 John F Hielscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:10
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/063; G10K1/064
Claims Analysis
Total Claims: 0
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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) | 1927-04-15 | 1927-10-15 | 1928-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-04-15 | 1931-10-15 | 1932-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-04-15 | 1935-10-15 | 1936-04-15 | $7700.00 | Window Closed / Lapsed |