Patent US3781508A successfully refreshed from Google Patents.
Patent US3336583A successfully refreshed from Google Patents.
US3336583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deformable magnetizable disc mounted on cylinder
Assignee: Potter Instrument Co Inc
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Filing: 1963-05-17
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Granted: 1967-08-15
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Expires: 1983-05-17
Abstract
No abstract record available.
Inventors
- 👤 D George E Comstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/82; G11B17/00; G11B17/32; G11B5/825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A RECORDING DRUM COMPRISING, A CYLINDER HAVING AN OPEN END, A DISC OF DEFORMABLE, MAGNETIZABLE MATERIAL STRETCHED OVER THE OPEN END OF THE CYLINDER, A READ/WRITE HEAD POSITIONED ADJACENT THE SURFACE OF THE DISC, AND MEANS FOR PRESSURIZING THE INTERIOR OF THE CYLINDER TO DEFORM THE DISC INTO THE INFORMATION-TRANSFERRING CONTACT WITH THE HEAD.
Claim 2
Dependent Claim
54 words
A RECORDING DRUM COMPRISING, A CYLINDER HAVING AN OPEN END, A DISC OF DEFORMABLE, MAGNETIZABLE MATERIAL STRETCHED OVER THE OPEN END OF THE CYLINDER, A READ/WRITE HEAD POSITIONED ADJACENT THE SURFACE OF THE DISC, AND MEANS FOR PRESSURIZING THE INTERIOR OF THE CYLINDER TO DEFORM THE DISC INTO THE INFORMATION-TRANSFERRING CONTACT WITH THE HEAD.
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) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |