Patent US2401619A successfully refreshed from Google Patents.
Patent US2193973A successfully refreshed from Google Patents.
US2193973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: Associated Electric Laboratories Inc
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Filing: 1938-04-04
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Granted: 1940-03-19
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Expires: 1958-04-04
Abstract
No abstract record available.
Inventors
- 👤 Lomax Clarence Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/544; H04J; H04J1/00; H04J1/02; H04J1/14; H04M; H04M7/00; H04M7/16; H04B2203/00; H04B2203/54; H04B2203/5429; H04B2203/5437
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) | 1943-03-19 | 1943-09-18 | 1944-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-19 | 1947-09-18 | 1948-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-19 | 1951-09-18 | 1952-03-19 | $7700.00 | Window Closed / Lapsed |