US2873813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic diaphragm and method of construction
Assignee: Hawley Products Co
•
Filing: 1955-07-27
•
Granted: 1959-02-17
•
Expires: 1975-07-27
Abstract
No abstract record available.
Inventors
- 👤 Jr William W Haerther
- 👤 Mauritz F Noren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:48
CPC Classifications
B; B29; B29C; B29C39/00; B29C43/00; B29C43/02; B29C43/021; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/58; D; D06; D06M; D06M15/00; D06M15/70; H; H04; H04R; H04R31/00; H04R31/003; H04R7/00; H04R7/02; H04R7/12; H04R7/127; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854; H04R2231/00; H04R2231/001; H04R2231/003; H04R2307/00; H04R2307/021; H04R2307/023; H04R2307/025; H04R2307/029; H04R2307/204
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |