Patent US3242459A successfully refreshed from Google Patents.
Patent US3344238A successfully refreshed from Google Patents.
US3344238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically conductive ink recording system
Assignee: —
•
Filing: —
•
Granted: 1967-09-26
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Expires: 1984-09-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:20
CPC Classifications
G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
THE METHOD OF AUDIBLY REPRODUCING A VISIBLE VARIABLE AREA SOUND PATTERN PRINTED ON A CARRIER WITH MAGNETICALLY CONDUCTIVE INK, SAID METHOD COMPRISING THE STEPS OF FIRST PRE-MAGNETIZING SAID PATTERN WITH A SIGNAL HAVING A FREQUENCY ABOVE THE AUDIBLE RANGE, AND THEN SCANNING THE PATTERN WITH A MAGNETIC SCANNING HEAD.
References Cited (Backward Citations)
US2559505A
Cited
US2868890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |