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Patent US1734624A successfully refreshed from Google Patents.
US1734624A
Expired / Lapsed
US
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Piston diaphragm having tangential corrugations
Assignee: AT&T Inc
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Filing: 1926-04-16
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Granted: 1929-11-05
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Expires: 1946-04-16
Abstract
No abstract record available.
Inventors
- 👤 Henry C Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:53
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/20; H04R2307/00; H04R2307/207
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) | 1932-11-04 | 1933-05-06 | 1933-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-11-04 | 1937-05-06 | 1937-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-11-04 | 1941-05-06 | 1941-11-05 | $7700.00 | Window Closed / Lapsed |