US3237280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnetic heads
Assignee: US Philips Corp
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Filing: 1960-09-06
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Granted: 1966-03-01
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Expires: 1980-09-06
Abstract
No abstract record available.
Inventors
- 👤 Manders Godefridus Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265; G11B5/1272; G11B5/133; G11B5/1335; G11B5/187; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF MANUFACTURING A MAGNETIC HEAD HAVING AT LEAST TWO PARALLEL NON-COLINEAR GAPS EACH LYING BETWEEN THE POLESHOES OF A MAGNETIC CIRCUIT CONSISTING OF TWO ADJACENT CORE HALVES, COMPRISING: FORMING A MECHANICALLY RIGID ASSEMBLY OF TWO CORE HALVES BELONGING TO DIFFERENT MAGNETIC CIRCUIT, SAID ASSEMBLY HAVING EXPOSED NONCOLINEAR POLESHOE FACES, GRINDING SAID POLESHOE FACES UNTIL THEY ARE SUBSTANTIALLY PLANO-PARALLEL, PLACING THE POLESHOE FACES OF CORRESPONDING CORE HALVES AGAINST THE TWO GROUND POLESHOE FACES OF THE ASSEMBLY, AND MECHANICALLY SECURING SAID CORRESPONDING CORE HALVES IN POSITION.
Claim 2
Independent Claim
86 words
A METHOD OF MANUFACTURING A MAGNETIC HEAD HAVING AT LEAST TWO PARALLEL NON-COLINEAR GAPS EACH LYING BETWEEN THE POLESHOES OF A MAGNETIC CIRCUIT CONSISTING OF TWO ADJACENT CORE HALVES, COMPRISING: FORMING A MECHANICALLY RIGID ASSEMBLY OF TWO CORE HALVES BELONGING TO DIFFERENT MAGNETIC CIRCUIT, SAID ASSEMBLY HAVING EXPOSED NONCOLINEAR POLESHOE FACES, GRINDING SAID POLESHOE FACES UNTIL THEY ARE SUBSTANTIALLY PLANO-PARALLEL, PLACING THE POLESHOE FACES OF CORRESPONDING CORE HALVES AGAINST THE TWO GROUND POLESHOE FACES OF THE ASSEMBLY, AND MECHANICALLY SECURING SAID CORRESPONDING CORE HALVES IN POSITION.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |