US3302271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic head assembly
Assignee: Sony Corp
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Filing: 1962-11-20
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Granted: 1967-02-07
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Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Matsumoto Kengo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1272; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055; Y10T29/49071; Y10T29/49073; Y10T29/49787; Y10T29/4981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A METHOD OF MANUFACTURING A MAGNETIC HEAD ASSEMBLY WITH WEAR RESISTANT WORKING FACES COMPRISING GRINDING A RECTANGULAR BAR OF MAGNETIC MATERIAL WHICH IS ELONGATED IN A LONGITUDINAL DIRECTION TO FORM A PLANAR FACE ALONG ONE SIDE THEREOF, ATTACHING A SHEET OF MAGNETIC WORKING FACE MATERIAL HAVING SUBSTANTIALLY GREATER ABRASION RESISTANCE THAN THE MAGNETIC MATERIAL OF SAID BAR TO SAID PLANAR FACE AT SAID ONE OF SAID BAR, FORMING A LONGITUDINAL CONCAVE PORTION IN AN ADJACENT PLANAR SIDE OF SAID BAR TO FORM A GENERALLY C-SHAPED FIRST MAGNETIC CORE MEMBER LEAVING A FRONT GAP SURFACE DEFINED BY SAID ADJACENT SIDE AND SAID SHEET AND LEAVING A BACK GAP SURFACE, COMBINING SAID FIRST MAGNETIC CORE MEMBER WITH A SECOND MAGNETIC CORE MEMBER MADE IN THE FASHION OF SAID CSHAPED FIRST MAGNETIC MEMBER TO FORM A TUBULAR MAGNETIC CORE ASSEMBLY WITH THE RESPECTIVE GAP SURFACES IN CONFRONTING RELATION, CUTTING SAID MAGNETIC CORE ASSEMBLY AT RIGHT ANGLES TO SAID LONGITUDINAL DIRECTION TO OBTAIN A PLURALITY OF RING-SHAPED MAGNETIC CORES, AND PROVIDING AN ELECTRIC WINDING ON EACH OF SAID RING-SHAPED MAGNETIC CORES WHICH EXTENDS ABOUT THE PORTION OF SAID FIRST MAGNETIC CORE MEMBER ASSOCIATED WITH SAID RING-SHAPED MAGNETIC CORE.
Claim 2
Independent Claim
194 words
A METHOD OF MANUFACTURING A MAGNETIC HEAD ASSEMBLY WITH WEAR RESISTANT WORKING FACES COMPRISING GRINDING A RECTANGULAR BAR OF MAGNETIC MATERIAL WHICH IS ELONGATED IN A LONGITUDINAL DIRECTION TO FORM A PLANAR FACE ALONG ONE SIDE THEREOF, ATTACHING A SHEET OF MAGNETIC WORKING FACE MATERIAL HAVING SUBSTANTIALLY GREATER ABRASION RESISTANCE THAN THE MAGNETIC MATERIAL OF SAID BAR TO SAID PLANAR FACE AT SAID ONE OF SAID BAR, FORMING A LONGITUDINAL CONCAVE PORTION IN AN ADJACENT PLANAR SIDE OF SAID BAR TO FORM A GENERALLY C-SHAPED FIRST MAGNETIC CORE MEMBER LEAVING A FRONT GAP SURFACE DEFINED BY SAID ADJACENT SIDE AND SAID SHEET AND LEAVING A BACK GAP SURFACE, COMBINING SAID FIRST MAGNETIC CORE MEMBER WITH A SECOND MAGNETIC CORE MEMBER MADE IN THE FASHION OF SAID CSHAPED FIRST MAGNETIC MEMBER TO FORM A TUBULAR MAGNETIC CORE ASSEMBLY WITH THE RESPECTIVE GAP SURFACES IN CONFRONTING RELATION, CUTTING SAID MAGNETIC CORE ASSEMBLY AT RIGHT ANGLES TO SAID LONGITUDINAL DIRECTION TO OBTAIN A PLURALITY OF RING-SHAPED MAGNETIC CORES, AND PROVIDING AN ELECTRIC WINDING ON EACH OF SAID RING-SHAPED MAGNETIC CORES WHICH EXTENDS ABOUT THE PORTION OF SAID FIRST MAGNETIC CORE MEMBER ASSOCIATED WITH SAID RING-SHAPED MAGNETIC CORE.
References Cited (Backward Citations)
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 |