US3047090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuned acoustical device
Assignee: Individual
•
Filing: 1958-05-07
•
Granted: 1962-07-31
•
Expires: 1978-05-07
Abstract
No abstract record available.
Inventors
- 👤 Robert G Pruden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2853; H04R1/2857; H04R1/30; H04R1/2869; H04R1/2876; H04R1/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1969704A
Cited
US2787332A
Cited
US2805729A
Cited
US2801704A
Cited
US2871971A
Cited
US2917127A
Cited
US2765864A
Cited
US2835335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |