US1368307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earpiece
Assignee: AT&T Inc
•
Filing: 1919-04-29
•
Granted: 1921-02-15
•
Expires: 1939-04-29
Abstract
No abstract record available.
Inventors
- 👤 Fred D Waldron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/16; H; H04; H04R; H04R1/00; H04R1/10; H04R1/1058
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) | 1924-02-15 | 1924-08-16 | 1925-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-02-15 | 1928-08-16 | 1929-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-02-15 | 1932-08-16 | 1933-02-15 | $7700.00 | Window Closed / Lapsed |