US2858899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High fidelity speaker enclosure system
Assignee: Individual
•
Filing: 1956-07-03
•
Granted: 1958-11-04
•
Expires: 1976-07-03
Abstract
No abstract record available.
Inventors
- 👤 Lopez-Henriquez Miguel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:58
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865; H04R1/2869; H04R1/2876; H04R1/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1865735A
Cited
FR695239A
Cited
US2050575A
Cited
US2020166A
Cited
US2034014A
Cited
US2491982A
Cited
US2694463A
Cited
US2731101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |