US3071843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating an array of magnetic cores
Assignee: International Business Machines Corp
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Filing: 1958-05-28
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Granted: 1963-01-08
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Expires: 1978-05-28
Abstract
No abstract record available.
Inventors
- 👤 Paul V Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:17
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/0005; C03C23/002; C03C15/00; C03C4/00; C03C4/04; G; G11; G11C; G11C5/00; G11C5/02; G11C5/04; G11C5/05; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A PROCESS FOR FABRICATING A MAGNETIC MEMORY ARRAY OF TOROIDAL FERRITE CORES HAVING PRINTED CIRCUIT WINDINGS AND INTERCONNECTIONS COMPRISING, FIRST FORMING A PLURALITY OF SPACED TOROIDAL SHAPED CAVITIES WITHIN OEN SURFACE ONLY OF A SHEET OF INSULATING MATERIAL, NEXT FORMING A PLURALITY OF HOLES THROUGH SAID SHEET WITH AT LEAST ONE OF SAID HOLES BEING WITHIN THE CENTRAL AREA BOUNDED BY EACH OF SAID TOROIDAL CAVITY, THEN POTTING THE CORES IN SAID CAVITIES, AND SUBSEQUENTLY DEPOSITING A CONDUCTIVE CIRCUIT PATTERN ON THE
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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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |