Patent US3366748A successfully refreshed from Google Patents.
US3366748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker diaphragm and driver
Assignee: Artnell Co
•
Filing: 1964-09-22
•
Granted: 1968-01-30
•
Expires: 1984-09-22
Abstract
No abstract record available.
Inventors
- 👤 William J Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:45
CPC Classifications
H; H04; H04R; H04R17/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1666198A
Cited
US1679194A
Cited
US1620367A
Cited
US1828513A
Cited
US2078385A
Cited
US2453521A
Cited
US2640889A
Cited
US2912605A
Cited
US3062926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |