US2565069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker of the double diaphragm type
Assignee: ROLA Co Inc
•
Filing: 1946-03-30
•
Granted: 1951-08-21
•
Expires: 1966-03-30
Abstract
No abstract record available.
Inventors
- 👤 Beatrice H Engholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R9/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1953542A
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US1848433A
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US1991221A
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US1897294A
Cited
GB413758A
Cited
US2007747A
Cited
US2084945A
Cited
GB451754A
Cited
US2231479A
Cited
US2371951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |