Patent US3222754A successfully refreshed from Google Patents.
US3222754A
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Method of making magnetic transducer head
Assignee: International Business Machines Corp
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Filing: 1959-12-23
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Granted: 1965-12-14
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Expires: 1979-12-23
Abstract
No abstract record available.
Inventors
- 👤 William J Homan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/11; G11B5/127; G11B5/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/49073; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
THE METHOD OF MAKING A TRANDUCER HEAD WHICH COMPRISES PROVIDING A MAGNETICALLY PERMEABLE CUP-SHAPED SHIELD, WITH A PORTION OF THE SHIELD BOTTOM ACTING AS A TEMPORARY HOLDING MEANS, PROVIDING AN OPENING IN THE BOTTOM OF THE SHIELD BOUNDED ON ONE SIDE THEREOF BY SAID TEMPORARY HOLDING MEANS, FITTING INTO SUCH OPENING A MAGNETICALLY PERMEABLE PROBE AND NON-MAGNETIC SPACING MEANS OF A TOTAL COMBINED THICKNESS EQUAL TO THE WIDTH OF THE OPENING, WHEREBY THE PROBE IS SUPPORTED IN THE OPENING IN UPWARDLY EXTENDING CONDITION WITHIN THE SHIELD, COATING THE INSIDE OF THE BOTTOM PORITON ACTING AS A TEMPORARY HOLDING MEANS WITH A NON-ADHERENT COATING MATERIAL, POURING INTO THE SHIELD A QUANTITY OF FLOWABLE, HARDENABLE, NON-MAGNETIC POTTING MATERIAL,HARDENING THE POTTING MATERIAL, AND REMOVING THE PORTION OF THE BOTTOM ACTING AS A TEMPORARY HOLDING MEANS.
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |