Patent US3737582A successfully refreshed from Google Patents.
US3737582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat magnetic heads
Assignee: 3M Co
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Filing: 1968-05-02
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Granted: 1973-06-05
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Expires: 1988-05-02
Abstract
Abstract This invention is directed to a magnetic transducing head for use with a moving magnetic recording medium. Specifically, the invention is directed to a physical construction for the magnetic transducing head for providing an improved contact between the magnetic medium and the magnetic transducing head wherein the magnetic transducing head includes a sharp leading edge constructed of wear-resistant material and wherein the leading edge forms an included angle of 90* or greater between the magnetic medium and the leading edge so that as the magnetic medium passes over the sharp leading edge, the leading edge removes air from the surface of the magnetic medium, which removal of air produces a pressure differential in a direction to urge the magnetic medium into contact with the face of the magnetic transducing head. Generally, the invention may also provide for a flat face for the magnetic transducing head so as to maintain the close contact between the magnetic medium and the face of the magnetic transducing head.
Inventors
- 👤 D Demoss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B15/00; G11B15/60; G11B15/62; G11B15/64; G11B5/255
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
In a magnetic transducing head for use with a relatively moving magnetic recording medium, physical construction for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges at the head, the leading edge for the flat face being wear-resistant and being shaped relative to the head and to the recording medium and being in contact with the recording medium to remove air from the surface of the recording medium adjacent to the flat face and to provide a pressure differential between the recording medium and the flat face of the transducing head at the leading edge to maintain the recording medium in contact with the flat face of the magnetic transducing head, the leading edge for the flat face being defined by an insert having higher wear-resistant properties than other materials located along the flat face of the magnetic transducer.
Claim 2
Dependent Claim
165 words
In a magnetic transducing head for use with a relatively moving magnetic recording medium, physical construction for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges at the head, the leading edge for the flat face being wear-resistant and being shaped relative to the head and to the recording medium and being in contact with the recording medium to remove air from the surface of the recording medium adjacent to the flat face and to provide a pressure differential between the recording medium and the flat face of the transducing head at the leading edge to maintain the recording medium in contact with the flat face of the magnetic transducing head, the leading edge for the flat face being defined by an insert having higher wear-resistant properties than other materials located along the flat face of the magnetic transducer.
Claim 3
Dependent Claim
45 words
In the magnetic transducing head of claim 1 wherein the leading edge for the flat face forms an angle of 90* or greater with the recording medium to facilitate the removal of air from the surface of the recording medium adjacent to the flat face.
Claim 4
Dependent Claim
35 words
In the magnetic transducing head of claim 1 wherein the recording medium forms an angle with the flat face of slightly less than 180* to insure contact between the leading edge and the recording medium.
Claim 5
Dependent Claim
164 words
In a magnetic transducing head for use with a relatively moving magnetic recording medium, physical construction for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges at the head, the leadIng edge for the flat face being wear-resistant and being shaped relative to the head and to the recording medium and being in contact with the recording medium to remove air from the surface of the recording medium adjacent to the flat face and to provide a pressure differential between the recording medium and the flat face of the transducing head at the leading edge to maintain the recording medium in contact with the flat face of the magnetic transducing head, the leading edge for the flat face forming an angle of greater than 90* with the recording medium to produce a self sharpening of the leading edge.
Claim 6
Dependent Claim
164 words
In a magnetic transducing head for use with a relatively moving magnetic recording medium, physical construction for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges at the head, the leadIng edge for the flat face being wear-resistant and being shaped relative to the head and to the recording medium and being in contact with the recording medium to remove air from the surface of the recording medium adjacent to the flat face and to provide a pressure differential between the recording medium and the flat face of the transducing head at the leading edge to maintain the recording medium in contact with the flat face of the magnetic transducing head, the leading edge for the flat face forming an angle of greater than 90* with the recording medium to produce a self sharpening of the leading edge.
Claim 7
Dependent Claim
183 words
A magnetic transducing head for use with a relatively moving magnetic recording medium and for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges and a face adjacent the recording medium, including the leading edge for the magnetic transducing head being sharp and the face of the head between the leading and trailing edges being flat and the magnetic head having an air gap between the leading and trailing edges and with the magnetic medium passing over and in contact with the leading edge and with the leading edge being shaped relative to the face of the head and to the medium to remove air between the surface of the recording medium and the leading edge of the magnetic head to produce a pressure differential for maintaining the magnetic medium in contact with the magnetic head at the leading edge and at the air gap of the magnetic head, the leading edge forming an angle of greater than 90* with the recording medium to produce a self sharpening of the leading edge.
Claim 8
Dependent Claim
183 words
A magnetic transducing head for use with a relatively moving magnetic recording medium and for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges and a face adjacent the recording medium, including the leading edge for the magnetic transducing head being sharp and the face of the head between the leading and trailing edges being flat and the magnetic head having an air gap between the leading and trailing edges and with the magnetic medium passing over and in contact with the leading edge and with the leading edge being shaped relative to the face of the head and to the medium to remove air between the surface of the recording medium and the leading edge of the magnetic head to produce a pressure differential for maintaining the magnetic medium in contact with the magnetic head at the leading edge and at the air gap of the magnetic head, the leading edge forming an angle of greater than 90* with the recording medium to produce a self sharpening of the leading edge.
Claim 9
Dependent Claim
161 words
A magnetic transducing head for use with a relatively moving magnetic recording medium and for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges and with the magnetic medium passing over the flat face, a sharp-edged wear-resistant insert located at the leading edge of the flat face of the magnetic head and with the insert forming an angle of at least 90* with the magnetic medium and with the sharp edge of the insert removing air from the surface of the magnetic medium to produce an excess air pressure on the medium at the surface opposite from the head to urge the magnetic medium in contact with the flat face for the magnetic head, the insert forming an angle of greater than 90* with the magnetic medium to produce a self sharpening of the insert.
Claim 10
Dependent Claim
161 words
A magnetic transducing head for use with a relatively moving magnetic recording medium and for providing an improved contact between the magnetic medium and the magnetic head, the magnetic head having leading and trailing edges, including a flat face for the magnetic transducing head between the leading and trailing edges and with the magnetic medium passing over the flat face, a sharp-edged wear-resistant insert located at the leading edge of the flat face of the magnetic head and with the insert forming an angle of at least 90* with the magnetic medium and with the sharp edge of the insert removing air from the surface of the magnetic medium to produce an excess air pressure on the medium at the surface opposite from the head to urge the magnetic medium in contact with the flat face for the magnetic head, the insert forming an angle of greater than 90* with the magnetic medium to produce a self sharpening of the insert.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |