US3936879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge type plaint disc apparatus
Assignee: CENTURY DATA SYSTEMS Inc
•
Filing: 1973-03-16
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Granted: 1976-02-03
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Expires: 1993-03-16
Abstract
Abstract The specification discloses a stepping motor operated cartridge type plaint disc memory utilizing a straddle erase read-write head. Additionally, means are provided for sensing index and sector positions on the disc, as well as the origin and extremities of head travel.
Inventors
- 👤 Kenneth Allan Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B19/00; G11B19/02; G11B19/04; G11B5/5526
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
In a pliant disk recording system of the type utilizing a rigid cartridge for retaining the disk, the improvement which comprises: a stepping motor having helically cut armature extension; a carriage adapted to translate in accordance with the rotation of said helically cut armature; a read/write straddle erase head attached to siad carriage adjacent to the recording surface of said pliant disk; means for actuating said stepping motor in accordance with external commands whereby said head may be incrementally moved from one track positon to another; means for detecting the limit positions of carriage travel, said means comprising: a tower having a photelectric sensor, said tower to be positioned adjacent to location at the end of carriage travel whereby the presence of the carriage will interrupt light impinging on said photoelectric sensor.
Claim 2
Dependent Claim
132 words
In a pliant disk recording system of the type utilizing a rigid cartridge for retaining the disk, the improvement which comprises: a stepping motor having helically cut armature extension; a carriage adapted to translate in accordance with the rotation of said helically cut armature; a read/write straddle erase head attached to siad carriage adjacent to the recording surface of said pliant disk; means for actuating said stepping motor in accordance with external commands whereby said head may be incrementally moved from one track positon to another; means for detecting the limit positions of carriage travel, said means comprising: a tower having a photelectric sensor, said tower to be positioned adjacent to location at the end of carriage travel whereby the presence of the carriage will interrupt light impinging on said photoelectric sensor.
References Cited (Backward Citations)
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |