US3094772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing magnetic heads with accurately predetermined gap heights
Assignee: US Philips Corp
•
Filing: 1957-06-26
•
Granted: 1963-06-25
•
Expires: 1977-06-26
Abstract
No abstract record available.
Inventors
- 👤 Duinker Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49055; Y10T29/49057; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF MANUFACTURING MAGNETIC HEADS FOR RECORDING OR REPRODUCING MAGNETIC RECORDINGS, COMPRISING THE STEPS OF INTERPOSING A NON-MAGNETIC MATERIAL CAPABLE OF BEING SOFTENED WHEN HEATED BETWEEN MACHINED EXPOSED SURFACES OF TWO MAGNETIC CIRCUIT PARTS, EACH OF SAID SURFACES HAVING DIMENSIONS OF HEIGHT AND WIDTH, EACH OF SAID HEIGHT DIMENSIONS BEING MEASURED BETWEEN TOP AND BOTTOM EDGES OF THE RESPECTIVE SURFACE, THE HEIGHT DIMENSION OF THE SURFACE OF ONE OF SAID PARTS EXCEEDING THE HEIGHT DIMENSION OF THE OTHER, HEATING THE ASSEMBLY TO A TEMPERATURE LYING IN THE SOFTENING RANGE OF THE NON-MAGNETIC
Claim 2
Independent Claim
93 words
A METHOD OF MANUFACTURING MAGNETIC HEADS FOR RECORDING OR REPRODUCING MAGNETIC RECORDINGS, COMPRISING THE STEPS OF INTERPOSING A NON-MAGNETIC MATERIAL CAPABLE OF BEING SOFTENED WHEN HEATED BETWEEN MACHINED EXPOSED SURFACES OF TWO MAGNETIC CIRCUIT PARTS, EACH OF SAID SURFACES HAVING DIMENSIONS OF HEIGHT AND WIDTH, EACH OF SAID HEIGHT DIMENSIONS BEING MEASURED BETWEEN TOP AND BOTTOM EDGES OF THE RESPECTIVE SURFACE, THE HEIGHT DIMENSION OF THE SURFACE OF ONE OF SAID PARTS EXCEEDING THE HEIGHT DIMENSION OF THE OTHER, HEATING THE ASSEMBLY TO A TEMPERATURE LYING IN THE SOFTENING RANGE OF THE NON-MAGNETIC
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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) | 1966-06-24 | 1966-12-24 | 1967-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-24 | 1970-12-24 | 1971-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-24 | 1974-12-24 | 1975-06-25 | $7700.00 | Window Closed / Lapsed |