US3120696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of multiple magnetic head units
Assignee: Curtiss Wright Corp
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Filing: 1960-03-11
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Granted: 1964-02-11
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Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Lubkin Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A METHOD OF MAKING A MAGNETIC HEAD WHICH HAS A NON-MAGNETIC BODY WITH PAIRS OF MAGNETIC POLE PIECES THEREIN, EACH POLE PIECE EXTENDING FROM THE INTERIOR OF THE BODY TO TWO TIPS EACH FLUSH WITH A FLAT OUTER POLE TIP SURFACE OF SAID BODY, COMPRISING THE STEPS OF FORMING OPPOSED MATCHING PARALLEL POLE-PIECE-RECEIVING SLOTS OF A GIVEN DEPTH IN A FIRST FLAT FACE OF EACH OF A PAIR OF SIMILAR NON-MAGNETIC SOLID BLOCKS, EACH SLOT EXTENDING THROUGH BOTH POLE TIP FACES OF ITS RESPECTIVE BLOCK, EACH SLOT CONFORMING CLOSELY TO THE THICKNESS OF THE POLE PIECE TO BE RECEIVED, INSERTING THE MAGNETIC POLE PIECES IN THE SLOTS, EACH POLE PIECE HAVING A WIDTH GREATER THAN THE DEPTHS OF ITS SLOT AND A LENGTH GREATER THAN THE LENGTH OF ITS SLOT SO AS TO PROJECT OUTWARDLY FROM ALL THREE MENTIONED FACES OF ITS BLOCK, SECURING THE POLE PIECES IN THE SLOTS IN SUCH PROJECTING DISPOSITION, SMOOTHING EACH OF THE FIRST BLOCK FACES TO REMOVE PROJECTING PORTIONS OF THE POLE PIECES AND TO FORM A SINGLE PLANE ON EACH FIRST FACE, SECURING THE TWO BLOCKS TOGETHER WITH THE SMOOTHED FACES AND PARALLEL SLOTS IN MATCHING OPPOSITION TO FORM A UNITARY BODY, AND THEN SMOOTHING BOTH POLE TIP FACES OF THE JOINED BLOCKS TO REMOVE PROJECTING PORTIONS OF THE POLE TIPS AND TO FORM A SINGLE PLANE ON EACH POLE TIP FACE OF THE SO COMPLETED BODY.
Claim 2
Independent Claim
234 words
A METHOD OF MAKING A MAGNETIC HEAD WHICH HAS A NON-MAGNETIC BODY WITH PAIRS OF MAGNETIC POLE PIECES THEREIN, EACH POLE PIECE EXTENDING FROM THE INTERIOR OF THE BODY TO TWO TIPS EACH FLUSH WITH A FLAT OUTER POLE TIP SURFACE OF SAID BODY, COMPRISING THE STEPS OF FORMING OPPOSED MATCHING PARALLEL POLE-PIECE-RECEIVING SLOTS OF A GIVEN DEPTH IN A FIRST FLAT FACE OF EACH OF A PAIR OF SIMILAR NON-MAGNETIC SOLID BLOCKS, EACH SLOT EXTENDING THROUGH BOTH POLE TIP FACES OF ITS RESPECTIVE BLOCK, EACH SLOT CONFORMING CLOSELY TO THE THICKNESS OF THE POLE PIECE TO BE RECEIVED, INSERTING THE MAGNETIC POLE PIECES IN THE SLOTS, EACH POLE PIECE HAVING A WIDTH GREATER THAN THE DEPTHS OF ITS SLOT AND A LENGTH GREATER THAN THE LENGTH OF ITS SLOT SO AS TO PROJECT OUTWARDLY FROM ALL THREE MENTIONED FACES OF ITS BLOCK, SECURING THE POLE PIECES IN THE SLOTS IN SUCH PROJECTING DISPOSITION, SMOOTHING EACH OF THE FIRST BLOCK FACES TO REMOVE PROJECTING PORTIONS OF THE POLE PIECES AND TO FORM A SINGLE PLANE ON EACH FIRST FACE, SECURING THE TWO BLOCKS TOGETHER WITH THE SMOOTHED FACES AND PARALLEL SLOTS IN MATCHING OPPOSITION TO FORM A UNITARY BODY, AND THEN SMOOTHING BOTH POLE TIP FACES OF THE JOINED BLOCKS TO REMOVE PROJECTING PORTIONS OF THE POLE TIPS AND TO FORM A SINGLE PLANE ON EACH POLE TIP FACE OF THE SO COMPLETED BODY.
References Cited (Backward Citations)
US2769866A
Cited
US2915812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |