US3913141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head azimuth positioning method using newton's rings
Assignee: Cal Comp Inc
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Filing: 1974-04-24
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Granted: 1975-10-14
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Expires: 1994-04-24
Abstract
Abstract The specification discloses a method and apparatus for positioning the gap of a magnetic transducer with respect to a pre-determined plane by noting the interference pattern caused by the transducer''s contact with a plexiglass bar.
Inventors
- 👤 Gary W Collins
- 👤 Daniel M Klang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/56; G01; G01B; G01B11/00; G01B11/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A method for aligning the gap between the poles of a magnetic head of the type having a curved surface comprising the steps of: positioning a flat rigid transparent surface in contact with the curved surface of the magnetic head; orienting the head azimuth while maintaining contact with the transparent surface; observing the interference produced at the contact point between the curved head and the transparent surface as the azimuth orientation of the head is changed; fixing the orientation of the head when the interference is coincident with the gap.
Claim 2
Independent Claim
90 words
A method for aligning the gap between the poles of a magnetic head of the type having a curved surface comprising the steps of: positioning a flat rigid transparent surface in contact with the curved surface of the magnetic head; orienting the head azimuth while maintaining contact with the transparent surface; observing the interference produced at the contact point between the curved head and the transparent surface as the azimuth orientation of the head is changed; fixing the orientation of the head when the interference is coincident with the gap.
References Cited (Backward Citations)
US3167143A
Cited
US3781489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |