Patent US3367877A successfully refreshed from Google Patents.
US2538869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic sound
Assignee: Hartford National Bank and Trust Co
•
Filing: 1947-03-25
•
Granted: 1951-01-23
•
Expires: 1967-03-25
Abstract
No abstract record available.
Inventors
- 👤 Holst Gilles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:40
CPC Classifications
G; G11; G11B; G11B7/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2414666A
Cited
US2191565A
Cited
US2195676A
Cited
US2367277A
Cited
US2249606A
Cited
US2303456A
Cited
US2287965A
Cited
US2352696A
Cited
US2347084A
Cited
US2415981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |