US3513266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording system for wideband signal multiplexing by frequency modulation
Assignee: International Business Machines Corp
•
Filing: 1967-02-27
•
Granted: 1970-05-19
•
Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 William T Frost
- 👤 Charles T Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N5/919
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |