Patent US2191993A successfully refreshed from Google Patents.
US2191993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone hand-set with combined transmitter and dial
Assignee: International Standard Electric Corp
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Filing: 1937-04-28
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Granted: 1940-02-27
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Expires: 1957-04-28
Abstract
No abstract record available.
Inventors
- 👤 Ernest S Mclarn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03; H04M1/0202
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) | 1943-02-26 | 1943-08-28 | 1944-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-26 | 1947-08-28 | 1948-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-26 | 1951-08-28 | 1952-02-27 | $7700.00 | Window Closed / Lapsed |