Patent US3179945A successfully refreshed from Google Patents.
US3179945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc storage device
Assignee: Laboratory For Electronics Inc
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Filing: 1961-03-21
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Granted: 1965-04-20
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Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Ascher H Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/488; G11B5/4886; G11B17/00; G11B17/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
APPARATUS FOR CONTROLLING THE CROSS-SECTIONAL SHAPE OF A MEMBRANE ROTATING IN A FLUID, COMPRISING, MEANS FOR SUPPORTING THE MEMBRANE CENTRALLY THEREOF AND ROTATING THE MEMBRANE, A STABILIZING PLATE HAVING A SURFACE ADJACENT TO A FIRST SURFACE OF THE MEMBRANE, MEANS FOR ESTABLISHING A FIRST FLUID PRESSURE GRADIENT IN THE CHANNEL DEFINED BY THE FIRST SURFACE OF THE MEMBRANE AND THE SURFACE OF THE STABILIZING PLATE AND RADIALLY OF THE MEMBRANE, A SHROUD HAVING A SURFACE ADJACENT TO THE SECOND SURFACE OF THE MEMBRANE AND MEANS FOR ESTABLISHING A SECOND FLUID PRESSURE GRADIENT IN THE SPACE DEFINED BY THE SECOND SURFACE OF THE MEMBRANE AND THE SURFACE OF THE SHROUD AND RADIALLY OF THE MEMBRANE, THE SECOND FLUID PRESSURE GRADIENT DIFFERING FROM THE FIRST FLUID PRESSURE GRADIENT.
Claim 2
Dependent Claim
126 words
APPARATUS FOR CONTROLLING THE CROSS-SECTIONAL SHAPE OF A MEMBRANE ROTATING IN A FLUID, COMPRISING, MEANS FOR SUPPORTING THE MEMBRANE CENTRALLY THEREOF AND ROTATING THE MEMBRANE, A STABILIZING PLATE HAVING A SURFACE ADJACENT TO A FIRST SURFACE OF THE MEMBRANE, MEANS FOR ESTABLISHING A FIRST FLUID PRESSURE GRADIENT IN THE CHANNEL DEFINED BY THE FIRST SURFACE OF THE MEMBRANE AND THE SURFACE OF THE STABILIZING PLATE AND RADIALLY OF THE MEMBRANE, A SHROUD HAVING A SURFACE ADJACENT TO THE SECOND SURFACE OF THE MEMBRANE AND MEANS FOR ESTABLISHING A SECOND FLUID PRESSURE GRADIENT IN THE SPACE DEFINED BY THE SECOND SURFACE OF THE MEMBRANE AND THE SURFACE OF THE SHROUD AND RADIALLY OF THE MEMBRANE, THE SECOND FLUID PRESSURE GRADIENT DIFFERING FROM THE FIRST FLUID PRESSURE GRADIENT.
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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |