Patent US2774924A successfully refreshed from Google Patents.
Patent US2381847A successfully refreshed from Google Patents.
US2381847A
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US
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System of communication by means of electrical waves
Assignee: International Standard Electric Corp
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Filing: 1941-11-08
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Granted: 1945-08-07
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Expires: 1961-11-08
Abstract
No abstract record available.
Inventors
- 👤 Ullrich Edward Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
H; H04; H04J; H04J7/00; C; C10; C10M; C10M107/00; C10M107/02; C10M107/08; C10M125/00; C10M125/26; C10M169/00; C10M169/04; C10M2201/00; C10M2201/06; C10M2201/061; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/084; C10M2201/087; C10M2201/10; C10M2201/102; C10M2201/105; C10M2201/16; C10M2201/18; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/0265; C10M2227/00; C10M2227/06; C10M2227/063; C10N; C10N2040/00; C10N2040/02
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) | 1948-08-06 | 1949-02-05 | 1949-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-06 | 1953-02-05 | 1953-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-06 | 1957-02-05 | 1957-08-07 | $7700.00 | Window Closed / Lapsed |