US3400217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for loudspeaker sound wave distribution
Assignee: OSCAR E KRAUT
•
Filing: 1965-02-08
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Granted: 1968-09-03
•
Expires: 1985-02-08
Abstract
No abstract record available.
Inventors
- 👤 Oscar E Kraut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:07
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/12; H04R3/14; H04R1/00; H04R1/20; H04R1/22; H04R1/26; H04R1/32; H04R1/34; H04R1/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2124597A
Cited
US2138717A
Cited
US2179840A
Cited
US2271100A
Cited
GB659818A
Cited
US2706529A
Cited
US3056857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |