US3529691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin equilateral sound speaker enclosure
Assignee: FRED A WESEMANN
•
Filing: 1969-05-27
•
Granted: 1970-09-22
•
Expires: 1989-05-27
Abstract
No abstract record available.
Inventors
- 👤 Fred A Wesemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:41
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2811; H04R1/26; H04R1/2869; H04R1/2884; H04R1/2888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2217279A
Cited
US3327808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |