Patent US4931987A successfully refreshed from Google Patents.
Patent US1979035A successfully refreshed from Google Patents.
US1979035A
Expired / Lapsed
US
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Automatic monitoring system
Assignee: HAMMOND HOLDING Corp
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Filing: 1929-11-12
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Granted: 1934-10-30
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Expires: 1949-11-12
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:56
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/62; H03; H03G; H03G3/00; H03G3/20; H03G5/00; H03G5/16; H03G5/18; H03G5/20; H03G5/22; H03G9/00; H03G9/02; H03G9/04; H03G9/10; H04R; H04R3/00
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) | 1937-10-29 | 1938-04-30 | 1938-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-29 | 1942-04-30 | 1942-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-29 | 1946-04-30 | 1946-10-30 | $7700.00 | Window Closed / Lapsed |