Patent US3302268A successfully refreshed from Google Patents.
US3302268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnetic heads using a jig for accurately determining gap height
Assignee: US Philips Corp
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Filing: 1962-03-05
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Granted: 1967-02-07
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Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 Duinker Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/4981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF MANUFACTURING MAGNETIC RECORDING AND/OR REPRODUCING HEADS HAVING A FRONTAL PORTION INCLUDING POLE PIECES AND AN ADJOINING REAR POSITION, COMPRISING: SECURING TOGETHER TWO FLAT FERRITE PLATES WITH A NONMAGNETIC BONDING AGENT, THEREBY FORMING A POLE PIECE ASSEMBLY WITH THE BONDING AGENT FORMING THE FUTURE GAP OF THE HEAD, GRINDING ONE END OF SID ASSEMBLY SUBSTANTIALLY TO THE REQUIRED SHAPE OF THE POLE FACE, PLACING SAID ASSEMBLY IN A JIG HAVING A MATING SURFACE WHICH CONFORMS IN SHAPE TO SAID POLE FACE AND A BASE SURFACE LOCATED A DISTANCE A FROM THE LOWERMOST PORTION OF SAID MATING SURFACE, SAID ONE END BEING PLACED AGAINST SAID MATING SURFACE, AND REMOVING SUFFICIENT MATERIAL INCLUDING A PORTION
Claim 2
Independent Claim
115 words
A METHOD OF MANUFACTURING MAGNETIC RECORDING AND/OR REPRODUCING HEADS HAVING A FRONTAL PORTION INCLUDING POLE PIECES AND AN ADJOINING REAR POSITION, COMPRISING: SECURING TOGETHER TWO FLAT FERRITE PLATES WITH A NONMAGNETIC BONDING AGENT, THEREBY FORMING A POLE PIECE ASSEMBLY WITH THE BONDING AGENT FORMING THE FUTURE GAP OF THE HEAD, GRINDING ONE END OF SID ASSEMBLY SUBSTANTIALLY TO THE REQUIRED SHAPE OF THE POLE FACE, PLACING SAID ASSEMBLY IN A JIG HAVING A MATING SURFACE WHICH CONFORMS IN SHAPE TO SAID POLE FACE AND A BASE SURFACE LOCATED A DISTANCE A FROM THE LOWERMOST PORTION OF SAID MATING SURFACE, SAID ONE END BEING PLACED AGAINST SAID MATING SURFACE, AND REMOVING SUFFICIENT MATERIAL INCLUDING A PORTION
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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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |