US3278914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic film storage device
Assignee: International Business Machines Corp
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Filing: 1962-12-06
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Granted: 1966-10-11
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Expires: 1982-12-06
Abstract
No abstract record available.
Inventors
- 👤 John L Rashleigh
- 👤 John S Mcmurtrie
- 👤 William C Bareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:15
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A MAGNETIC FILM STORAGE DEVICE COMPRISING: A SOLE ORIENTED MAGNETIC FILM HAVING HARD AND EASY DIRECTIONS OF MAGNETIZATION; AN ELECTRICAL CONDUCTOR MEANS FOR PRODUCING A PARTIAL BIAS IN SAID FILM IN THE HARD DIRECTION; MEANS FOR PRODUCING BIPOLAR EASY AXIS BIT FIELDS IN SAID FILM; MEANS FOR PRODUCING A WRITING WORD FIELD IN SAID FILM ALONG THE HARD AXIS, POLARIZED SIMILARLY TO THE BIAS, AND TOTALING WITH THE BIAS LESS THAN THE SATURATION
Claim 2
Dependent Claim
73 words
A MAGNETIC FILM STORAGE DEVICE COMPRISING: A SOLE ORIENTED MAGNETIC FILM HAVING HARD AND EASY DIRECTIONS OF MAGNETIZATION; AN ELECTRICAL CONDUCTOR MEANS FOR PRODUCING A PARTIAL BIAS IN SAID FILM IN THE HARD DIRECTION; MEANS FOR PRODUCING BIPOLAR EASY AXIS BIT FIELDS IN SAID FILM; MEANS FOR PRODUCING A WRITING WORD FIELD IN SAID FILM ALONG THE HARD AXIS, POLARIZED SIMILARLY TO THE BIAS, AND TOTALING WITH THE BIAS LESS THAN THE SATURATION
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |