US3264621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic data store
Assignee: Unisys Corp
•
Filing: 1963-03-25
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Granted: 1966-08-02
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Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert L Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:04
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/04; G11C27/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
A MAGNETIC DATA STORE COMPRISING A CENTRAL CONDUCTOR SURROUNDED BY MAGNETIC MATERIAL HAVING A DIRECTION OF EASY MAGNETIZATION SUBSTANTIALLY HELICAL AROUND SAID CENTRAL CONDUCTOR AND EXHIBITING A SUBSTANTIALLY RECTANGULAR HYSTERESIS CHARACTERISTIC, FIRST SOLENOIDS OF PREDETERMINED LENGTH WOUND EXTERNALLY AROUND SAID CENTRAL CONDUCTOR AND SAID MAGNETIC MATERIAL AT SELECTED LOCATIONS ALONG THE LENGTH OF SAID CENTRAL CONDUCTOR, SECOND SOLENOIDS OF CONSIDERABLY SHORTER LENGTH THAN SAID FIRST SOLENOIDS, EACH OF SAID SECOND SOLENOIDS BEING WOUND AROUND THE SAID CENTRAL CONDUCTOR AND SAID MAGNETIC MATERIAL IN A MEDIAL POSITION WITH RESPECT TO THE AXIAL LENGTH OF A SAID FIRST SOLENOID.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |