US3174152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum
Assignee: International Business Machines Corp
•
Filing: 1959-09-30
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Granted: 1965-03-16
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Expires: 1979-09-30
Abstract
No abstract record available.
Inventors
- 👤 William R Maclay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:58
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/02; G11B5/00; G11B5/74; G11B5/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A ROTATABLE MAGNETIC DRUM FOR STORING INFORMATION ON THE PERIPHERAL SURFACE THEREOF, THE ROTATABLE DRUM HAVING A HIGH RESONANT FREQUENCY ABOUT ORTHOGONAL AXES, SAID DRUM COMPRISING; A THIN SHEET METAL END SECTIONS IN AXIAL THIN TUBULAR SUPPORT SHAFT CONCENTRIC WITHIN SAID THIN CYLINDRICAL SHELL, THIN SHEET METAL END SECTIONS IN THE FORM OF A SURFACE OF REVOLUTION HAVING AT LEAST ONE FINITE RADIUS OF CURVATURE CONNECTING SAID THIN SHELL TO SAID TUBULAR SUPPORT SHAFT, WHEREBY THE MOMENT OF INERTIA ABOUT THE AXIS OF THE DRUM WILL BE HIGH AND FURTHER PROVIDING STIFFNESS AND A HIGH RESONANT FREQUENCY OF VIBRATION.
Claim 2
Dependent Claim
99 words
A ROTATABLE MAGNETIC DRUM FOR STORING INFORMATION ON THE PERIPHERAL SURFACE THEREOF, THE ROTATABLE DRUM HAVING A HIGH RESONANT FREQUENCY ABOUT ORTHOGONAL AXES, SAID DRUM COMPRISING; A THIN SHEET METAL END SECTIONS IN AXIAL THIN TUBULAR SUPPORT SHAFT CONCENTRIC WITHIN SAID THIN CYLINDRICAL SHELL, THIN SHEET METAL END SECTIONS IN THE FORM OF A SURFACE OF REVOLUTION HAVING AT LEAST ONE FINITE RADIUS OF CURVATURE CONNECTING SAID THIN SHELL TO SAID TUBULAR SUPPORT SHAFT, WHEREBY THE MOMENT OF INERTIA ABOUT THE AXIS OF THE DRUM WILL BE HIGH AND FURTHER PROVIDING STIFFNESS AND A HIGH RESONANT FREQUENCY OF VIBRATION.
References Cited (Backward Citations)
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Cited
US2810622A
Cited
US2958849A
Cited
US2916726A
Cited
US2794180A
Cited
US2905933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |