US3014996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker construction
Assignee: Individual
•
Filing: 1956-05-18
•
Granted: 1961-12-26
•
Expires: 1976-05-18
Abstract
No abstract record available.
Inventors
- 👤 Swanson Carl Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:28
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1907687A
Cited
US1941476A
Cited
US2046515A
Cited
US2221068A
Cited
US2538621A
Cited
US2524836A
Cited
US2666980A
Cited
GB638080A
Cited
US2554859A
Cited
GB686934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |