Patent US3317408A successfully refreshed from Google Patents.
US3317408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a magnetic core storage device
Assignee: North American Aviation Corp
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Filing: 1963-06-11
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Granted: 1967-05-02
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Creighton D Barnes
- 👤 Joseph M Shaheen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/165; G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; H05K2201/00; H05K2201/08; H05K2201/083; H05K2201/086; H05K2201/09; H05K2201/09009; H05K2201/09063; H05K2201/09209; H05K2201/09654; H05K2201/09809; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/0554; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K2203/11; H05K2203/1184; H05K3/00; H05K3/0011; H05K3/0017; H05K3/002; H05K3/40; H05K3/42; H05K3/429; H05K3/44; H05K3/445
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
236 words
A METHOD OF FABRICATING A MAGNETIC CORE STORAGE DEVICE HAVING A PLURALITY OF TOROIDAL MAGNETIC CORES DISPOSED IN A PLANE AND AN ELECTROPLATED SINGLE TURN WINDING THROUGH THE APERTURE OF EACH CORE COMPIRSING PREPARING A CLEAN BOARD OF INSULATING MATERIAL HAVING TOP AND BOTTOM SHEETS OF ELECTRICALLY CONDUCTIVE MATERIAL LAMINATED TO OPPOSITE SIDES THEREOF, DEPOSITING A FIRST COAT OF PHOTOSENSITIVE EMULSION ON BOTH SHEETS OF CONDUCTIVE MATERIAL AND PHOTO-EXPOSING SAID FIRST COAT OF EMULSION ON BOTH SHEETS THROUGH A PHOTOGRAPHIC POSITIVE OF A PATTERN OF DESIRED HOLES WHERE CORES ARE TO BE DEPOSITED, THEREBY HARDENING THE EMULSION AROUND SAID PATTERN OF DESIRED HOLES IN SAID TOP AND BOTTOM SHEETS, REMOVING THE UNEXPOSED EMULSION WITH A SUITABLE SOLVENT AND ETCHING SAID PATTERN OF DESIRED HOLES THROUGH SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL WITH A FIRST ETCHING SOLUTION WHICH WILL NOT MATERIALLY DISSOLVE THE HARDENED EMULSION AND SAID INSULATING MATERIAL, REMOVING THE HARDENED PHOTOSENSITIVE EMULSION AND ETCHING BACK OF SAID DESIRED HOLES THROUGH SAID INSULATING MATERIAL, TO A LARGER DIAMETER THAN THE ETCHED HOLES THROUGH SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL, WITH A SECOND ETCHING SOLUTION WHICH WILL NOT MATERIALLY DISSOLVE THE CONDUCTIVE MATERIAL, THEREBY USING SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL HAVING THE DESIRED PATTERN OF HOLES ETCHED THERETHROUGH AS A MASK, ETCHING THE HOLES IN THE TOP HSEET OF CONDUCTIVE MATERIAL TO THE SAME DIAMETER AS THE HOLES THROUGH THE
Claim 2
Independent Claim
236 words
A METHOD OF FABRICATING A MAGNETIC CORE STORAGE DEVICE HAVING A PLURALITY OF TOROIDAL MAGNETIC CORES DISPOSED IN A PLANE AND AN ELECTROPLATED SINGLE TURN WINDING THROUGH THE APERTURE OF EACH CORE COMPIRSING PREPARING A CLEAN BOARD OF INSULATING MATERIAL HAVING TOP AND BOTTOM SHEETS OF ELECTRICALLY CONDUCTIVE MATERIAL LAMINATED TO OPPOSITE SIDES THEREOF, DEPOSITING A FIRST COAT OF PHOTOSENSITIVE EMULSION ON BOTH SHEETS OF CONDUCTIVE MATERIAL AND PHOTO-EXPOSING SAID FIRST COAT OF EMULSION ON BOTH SHEETS THROUGH A PHOTOGRAPHIC POSITIVE OF A PATTERN OF DESIRED HOLES WHERE CORES ARE TO BE DEPOSITED, THEREBY HARDENING THE EMULSION AROUND SAID PATTERN OF DESIRED HOLES IN SAID TOP AND BOTTOM SHEETS, REMOVING THE UNEXPOSED EMULSION WITH A SUITABLE SOLVENT AND ETCHING SAID PATTERN OF DESIRED HOLES THROUGH SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL WITH A FIRST ETCHING SOLUTION WHICH WILL NOT MATERIALLY DISSOLVE THE HARDENED EMULSION AND SAID INSULATING MATERIAL, REMOVING THE HARDENED PHOTOSENSITIVE EMULSION AND ETCHING BACK OF SAID DESIRED HOLES THROUGH SAID INSULATING MATERIAL, TO A LARGER DIAMETER THAN THE ETCHED HOLES THROUGH SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL, WITH A SECOND ETCHING SOLUTION WHICH WILL NOT MATERIALLY DISSOLVE THE CONDUCTIVE MATERIAL, THEREBY USING SAID TOP AND BOTTOM SHEETS OF CONDUCTIVE MATERIAL HAVING THE DESIRED PATTERN OF HOLES ETCHED THERETHROUGH AS A MASK, ETCHING THE HOLES IN THE TOP HSEET OF CONDUCTIVE MATERIAL TO THE SAME DIAMETER AS THE HOLES THROUGH THE
References Cited (Backward Citations)
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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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |