US2818130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker diaphragms
Assignee: WHITELEY ELECTRICAL RADIO Co Ltd
•
Filing: 1954-04-13
•
Granted: 1957-12-31
•
Expires: 1974-04-13
Abstract
No abstract record available.
Inventors
- 👤 Whiteley Alfred Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:40
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; H04R7/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2006830A
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US2017496A
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US2152901A
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US2146975A
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US2206517A
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US2502853A
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US2596364A
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US2549091A
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US2624417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |