US2849542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for magnetic recording of sound on record cards
Assignee: ELLAMAC Inc
•
Filing: 1952-12-31
•
Granted: 1958-08-26
•
Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Chester M Macchesney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:06
CPC Classifications
G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US873084A
Cited
US2086798A
Cited
US2092765A
Cited
US2124673A
Cited
US2427383A
Cited
US2714010A
Cited
US2603006A
Cited
US2548011A
Cited
US2647168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |