US2610694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic reproduction apparatus
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-04-08
•
Granted: 1952-09-16
•
Expires: 1966-04-08
Abstract
No abstract record available.
Inventors
- 👤 Boer Kornelis De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:04
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02; H04R1/00; H04R1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1932343A
Cited
GB404937A
Cited
US1915954A
Cited
FR758706A
Cited
US2114680A
Cited
FR790599A
Cited
US2217279A
Cited
GB551364A
Cited
US2410413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |