US4625245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording
Assignee: Individual
•
Filing: 1984-11-08
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Granted: 1986-11-25
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Expires: 2004-11-08
Abstract
Abstract Magnetic recording of a data continuum is effected by means of sequential impulses of recording current. The impulses occur at regular intervals providing samples of the data continuum. The impulses are of very short time duration, in that each impulse extends for only a small fraction of the time interval that is required for a point on the record medium to traverse the effective recording field of the record head. The time spacing between impulses is approximately equal to said time interval, thereby providing a magnetic recording continuum corresponding to said data continuum.
Inventors
- 👤 R. Kent White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:49
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B5/00; G11B5/02; G11B5/09
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
139 words
A method of magnetic recording by means of a magnetic recording head having a recording gap and a magnetic recording medium having a recording surface, wherein a relative traverse is effected between said head and said medium across said gap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, comprising applying to said recording head a sequence of electrical impulses of short time duration and at spaced time intervals for effecting magnetic recording thereof in said medium as recorded increments, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap.
Claim 2
Independent Claim
139 words
A method of magnetic recording by means of a magnetic recording head having a recording gap and a magnetic recording medium having a recording surface, wherein a relative traverse is effected between said head and said medium across said gap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, comprising applying to said recording head a sequence of electrical impulses of short time duration and at spaced time intervals for effecting magnetic recording thereof in said medium as recorded increments, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap.
Claim 3
Dependent Claim
31 words
A method as set forth in claim 1, wherein the lengths of said time intervals, time period and time duration are selected to produce a moderate overlap of sucessive recorded increments.
Claim 4
Dependent Claim
32 words
A method as set forth in claim 2, wherein the lengths of said time intervals, time period and time duration are selected to produce about a one-third overlap of successive recorded increments.
Claim 5
Dependent Claim
31 words
A method as set forth in claim 1, wherein the lengths of said time intervals, time period and time duration are selected to produce substantially no overlap of successive recorded increments.
Claim 6
Independent Claim
167 words
A method of magnetic recording an electrical signal embodying a waveform by means of a magnetic recording head having a recording gap and a magnetic recording medium having a recording surface, wherein a relative traverse is effected between said head and said medium across said zap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, comprising applying to said recording head a sequence of electrical impulses of short duration at spaced time intervals for effecting magnetic recording thereof in said medium as a succession of recorded increments representative of segments of said waveform, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap, whereby said succession of recorded increments constitutes substantially a recorded continuum representative of said waveform.
Claim 7
Independent Claim
167 words
A method of magnetic recording an electrical signal embodying a waveform by means of a magnetic recording head having a recording gap and a magnetic recording medium having a recording surface, wherein a relative traverse is effected between said head and said medium across said zap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, comprising applying to said recording head a sequence of electrical impulses of short duration at spaced time intervals for effecting magnetic recording thereof in said medium as a succession of recorded increments representative of segments of said waveform, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap, whereby said succession of recorded increments constitutes substantially a recorded continuum representative of said waveform.
Claim 8
Dependent Claim
31 words
A method as set forth in claim 5, wherein the lengths of said time intervals, time period and time duration are selected to produce a moderate overlap of successive recorded increments.
Claim 9
Dependent Claim
32 words
A method as set forth in claim 6, wherein the lengths of said time intervals, time period and time duration are selected to produce about a one-third overlap of successive recorded increments.
Claim 10
Dependent Claim
26 words
A method as set forth in claim 5, and further including means for transducing said recorded continuum to an electrical signal substantially corresponding to said waveform.
Claim 11
Dependent Claim
31 words
A method as set forth in claim 5, wherein the lengths of said time intervals, time oeriod and time duration are selected to produce substantially no overlap of successive recorded increments.
Claim 12
Dependent Claim
172 words
In a system for magnetic recording of an electrical signal embodying a waveform, including a magnetic recording head having a recording gap, a magnetic recording medium having a recording surface, and means for effecting relative traverse between said head and said medium across said gap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, the improvement comprising means for generating and applying to said recording head a sequence of electrical impulses of short duration at spaced time intervals for effecting magnetic recording thereof in said medium as a succession of recorded increments representative of segments of said waveform, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap, whereby said succession of recorded increments constitutes substantially a recorded continuum representative of said waveform.
Claim 13
Dependent Claim
172 words
In a system for magnetic recording of an electrical signal embodying a waveform, including a magnetic recording head having a recording gap, a magnetic recording medium having a recording surface, and means for effecting relative traverse between said head and said medium across said gap, said head providing a determined length of effective recording field along the line of said traverse approximating the length of said gap, the improvement comprising means for generating and applying to said recording head a sequence of electrical impulses of short duration at spaced time intervals for effecting magnetic recording thereof in said medium as a succession of recorded increments representative of segments of said waveform, the time duration of each of said impulses being a small fraction of the time period for said traverse across said gap, and the length of each of said time intervals between impulses being approximately equal to said time period of traverse across said recording gap, whereby said succession of recorded increments constitutes substantially a recorded continuum representative of said waveform.
Claim 14
Dependent Claim
24 words
In a system as set forth in claim 10, means for transducing said recorded continuum to an electrical signal substantially corresponding to said waveform.
Claim 15
Dependent Claim
31 words
In a system as set forth in claim 11, the lengths of said time intervals, time periods and time duration being selected to produce a moderate overlap of successive recorded increments.
Claim 16
Dependent Claim
32 words
In a system as set forth in claim 12, the lengths of said time intervals, time periods and time duration being selected to produce about a one-third overlap of successive recorded increments.
Claim 17
Dependent Claim
31 words
In a system as set forth in claim 11, the lengths of said time intervals, time periods and time duration being selected to produce substantially no overlap of successive recorded increments.
Claim 18
Dependent Claim
31 words
In a system as set forth in claim 10, the lengths of said time intervlas, time periods and time duration being selected to produce a moderate overlap of successive recorded increments.
Claim 19
Dependent Claim
32 words
In a system as set forth in claim 15, the lengths of said time intervals, time periods and time duration being selected to produce about a one-third overlap of successive recorded increments.
Claim 20
Dependent Claim
31 words
In a system as set forth in claim 10, the lengths of said time intervals, time periods and time duration being selected to produce substantially no overlap of successive recorded increments.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |