US2678436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized alternating current ringer or buzzer for telephone subsets and similar apparatus
Assignee: International Standard Electric Corp
•
Filing: 1952-02-19
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Granted: 1954-05-11
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Expires: 1972-02-19
Abstract
No abstract record available.
Inventors
- 👤 Compare Renato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:42
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/063; G10K1/064; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0744
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |