Patent US3390385A successfully refreshed from Google Patents.
US3390385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum recording apparatus with replaceable sleeve
Assignee: Unisys Corp
•
Filing: 1966-02-01
•
Granted: 1968-06-25
•
Expires: 1986-02-01
Abstract
No abstract record available.
Inventors
- 👤 Gregory J Ehalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A MAGNETIC RECORDING-REPRODUCING APPARATUS WHERE MAGNETIC TRANSDUCER MEMBERS RECORD AND REPRODUCE FROM A RECORD SURFACE COMPRISING: (A) A ROTATABLE MANDREL MEANS; (B) A DRIVING MEANS CONNECTED TO SAID MANDREL MEANS FOR EFFECTING ROTATION THEREOF; (C) A SEPARATE RECORDING SLEEVE MEANS HAVING AN INNER SURFACE AND CONTAINING ON A PERIPHERAL SURFACE THEREOF A MAGNETIZABLE COATING, SAID SLEEVE MEANS BEING ADAPTED TO BE RECEIVED BY A SURFACE OF SAID ROTATABLE MANDREL MEANS; AND (D) SAID ROTATABLE MANDREL MEANS SUPPORTING PRESSURE MEANS FOR APPLYING A POSITIVE PRESSURE DIRECTED OUTWARDLY FOR MAINTAINING SAID SLEEVE MEANS AND SAID MANDREL MEANS IN A NON-RELATIVE MOTIN RELATIONSHIP WITH RESPECT TO EACH OTHER WHEN SAID MANDREL MEANS IS IN A ROTATING CONDITION.
Claim 2
Dependent Claim
115 words
IN A MAGNETIC RECORDING-REPRODUCING APPARATUS WHERE MAGNETIC TRANSDUCER MEMBERS RECORD AND REPRODUCE FROM A RECORD SURFACE COMPRISING: (A) A ROTATABLE MANDREL MEANS; (B) A DRIVING MEANS CONNECTED TO SAID MANDREL MEANS FOR EFFECTING ROTATION THEREOF; (C) A SEPARATE RECORDING SLEEVE MEANS HAVING AN INNER SURFACE AND CONTAINING ON A PERIPHERAL SURFACE THEREOF A MAGNETIZABLE COATING, SAID SLEEVE MEANS BEING ADAPTED TO BE RECEIVED BY A SURFACE OF SAID ROTATABLE MANDREL MEANS; AND (D) SAID ROTATABLE MANDREL MEANS SUPPORTING PRESSURE MEANS FOR APPLYING A POSITIVE PRESSURE DIRECTED OUTWARDLY FOR MAINTAINING SAID SLEEVE MEANS AND SAID MANDREL MEANS IN A NON-RELATIVE MOTIN RELATIONSHIP WITH RESPECT TO EACH OTHER WHEN SAID MANDREL MEANS IS IN A ROTATING CONDITION.
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |