US3200385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum recorder including a landing track
Assignee: Unisys Corp
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Filing: 1960-04-27
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Granted: 1965-08-10
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Expires: 1980-04-27
Abstract
No abstract record available.
Inventors
- 👤 Welsh Herbert Frazer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/56; G11B5/54; G11B5/55; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A MAGNETIC DRUM ADAPTED TO ROTATE AT A PREDETERMINED RATE OF SPEED, SAID DRUM HAVING CIRCUMFERENTIAL TRACKS ON THE SURFACE OF SAID DRUM, AT LEAST ONE OF SAID TRACKS CONTAINING NO INFORMATION THEREIN, A FLYING HEAD ADAPTED TO BE RAISED AND LOWERED IN COOPERATION WITH SAID DRUM, A MOTOR FOR ROTATING SAID DRUM, MEANS FOR DETECTING THE SPEED OF ROTATION OF SAID DRUM, SENSING MEANS FOR DETERMINING WHEN SAID HEAD IS AT ONE OF SAID NO INFORMATION TRACKS, AND MEANS FOR LOWERING SAID HEAD WHEN SAID DRUM IS ROTATING AT SAID PREDETERMINED SPEED AND SAID HEAD IS AT ONE OF SAID NO INFORMATION TRACKS.
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) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |