Patent US1581700A successfully refreshed from Google Patents.
US1581700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear-supported telephone receiver
Assignee: Individual
•
Filing: 1923-05-29
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Granted: 1926-04-20
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Expires: 1943-05-29
Abstract
No abstract record available.
Inventors
- 👤 Philip V Summer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:12
CPC Classifications
H; H04; H04R; H04R25/00; H04R1/00; H04R1/10; H04R1/1016; H04R1/105; H04R1/1058; H04R1/1075; H04R1/20; H04R1/32; H04R1/34; H04R1/345
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) | 1929-04-19 | 1929-10-19 | 1930-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-04-19 | 1933-10-19 | 1934-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-04-19 | 1937-10-19 | 1938-04-20 | $7700.00 | Window Closed / Lapsed |