Patent US3145452A successfully refreshed from Google Patents.
US3145452A
Expired / Lapsed
US
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Method of making a magnetic head
Assignee: IIT Research Institute
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Filing: 1958-03-24
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Granted: 1964-08-25
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Expires: 1978-03-24
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:13
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/1335; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055; Y10T29/49057; Y10T29/49071; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF MAKING POLE PIECE ASSEMBLIES FOR MAGNETIC HEADS WHICH COMPRISES POLISHING TO A FLAT PLANAR CONFIGURATION SURFACES OF A PAIR OF BLOCKS OF FERRITE MATERIAL, PLACING SAID SURFACES IN CONFRONTING RELATION WITH A MAGNETIC GAP THEREBETWEEN, SECURING SAID BLOCKS TO EACH OTHER BY MEANS OF A NON-MAGNETIC BONDING MATERIAL WHICH IS SUBSTANTIALLY RIGIDLY CONNECTED WITH SAID BLOCKS AND WHICH EXTENDS CONTINUOUSLY THEREBETWEEN OVER SUBSTANTIALLY THE ENTIRE AREA OF SAID CONFRONTING SURFACES, SUBDIVIDING THE BLOCKS INTO UNITS EACH INCLUDING A PORTION OF ONE BLOCK AND A PORTION OF THE OTHER BLOCK DIRECTLY ACROSS SAID GAP THEREFROM WITH A PORTION OF THE BONDING
Claim 2
Independent Claim
103 words
THE METHOD OF MAKING POLE PIECE ASSEMBLIES FOR MAGNETIC HEADS WHICH COMPRISES POLISHING TO A FLAT PLANAR CONFIGURATION SURFACES OF A PAIR OF BLOCKS OF FERRITE MATERIAL, PLACING SAID SURFACES IN CONFRONTING RELATION WITH A MAGNETIC GAP THEREBETWEEN, SECURING SAID BLOCKS TO EACH OTHER BY MEANS OF A NON-MAGNETIC BONDING MATERIAL WHICH IS SUBSTANTIALLY RIGIDLY CONNECTED WITH SAID BLOCKS AND WHICH EXTENDS CONTINUOUSLY THEREBETWEEN OVER SUBSTANTIALLY THE ENTIRE AREA OF SAID CONFRONTING SURFACES, SUBDIVIDING THE BLOCKS INTO UNITS EACH INCLUDING A PORTION OF ONE BLOCK AND A PORTION OF THE OTHER BLOCK DIRECTLY ACROSS SAID GAP THEREFROM WITH A PORTION OF THE BONDING
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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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |