US2666980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making loud-speakers
Assignee: ROLA Co Inc
•
Filing: 1949-11-17
•
Granted: 1954-01-26
•
Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Earl L Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005; Y10T29/4902; Y10T29/49073; Y10T29/49075
Claims Analysis
Total Claims: 0
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US2524836A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |