US2987712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault alarm system
Assignee: TDK Micronas GmbH
•
Filing: 1957-09-12
•
Granted: 1961-06-06
•
Expires: 1977-09-12
Abstract
No abstract record available.
Inventors
- 👤 Polyzou James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:26
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/10; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2393021A
Cited
US2494370A
Cited
US2605340A
Cited
US2546307A
Cited
US2764754A
Cited
US2730579A
Cited
US2668283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |