US1495429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezophony
Assignee: AT&T Inc
•
Filing: 1918-04-10
•
Granted: 1924-05-27
•
Expires: 1938-04-10
Abstract
No abstract record available.
Inventors
- 👤 Nicolson Alexander Mclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:21
CPC Classifications
H; H04; H04R; H04R17/00
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) | 1927-05-27 | 1927-11-26 | 1928-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-05-27 | 1931-11-26 | 1932-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-05-27 | 1935-11-26 | 1936-05-27 | $7700.00 | Window Closed / Lapsed |