US2156504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic device supporter
Assignee: Individual
•
Filing: 1938-07-19
•
Granted: 1939-05-02
•
Expires: 1958-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bess S Liss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:44
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/12; H; H04; H04R; H04R25/00; H04R25/04; H04R2460/00; H04R2460/17
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) | 1942-05-01 | 1942-10-31 | 1943-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-01 | 1946-10-31 | 1947-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-01 | 1950-10-31 | 1951-05-02 | $7700.00 | Window Closed / Lapsed |