Patent US3544980A successfully refreshed from Google Patents.
US3544980A
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Magnetic recording disc drive with head positioning and collision avoidance apparatus
Assignee: Peripheral Systems Corp
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Filing: 1968-03-22
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Granted: 1970-12-01
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Expires: 1988-03-22
Abstract
No abstract record available.
Inventors
- 👤 Roy A Applequist
- 👤 Laurence M Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/4806; G11B5/4826; G11B5/54; G11B5/55; G11B5/5521; G11B5/5552; G11B5/5556; G11B5/58; G11B5/60; H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356; H02P; H02P25/00; H02P25/02; H02P25/032; H02P25/034
Claims Analysis
Total Claims: 0
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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) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |