US3449519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker system for sound-wave amplification
Assignee: MOREY J MOWRY
•
Filing: 1968-01-24
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Granted: 1969-06-10
•
Expires: 1988-01-24
Abstract
No abstract record available.
Inventors
- 👤 Morey J Mowry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:59
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2942070A
Cited
US2852604A
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US2982821A
Cited
US3022377A
Cited
US3145265A
Cited
US3105569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |