Patent US3225338A successfully refreshed from Google Patents.
US3225338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc storage device
Assignee: Laboratory For Electronics Inc
•
Filing: 1961-03-21
•
Granted: 1965-12-21
•
Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Kelner Robert
- 👤 Pearson Robert
- 👤 Roger K Lee
- 👤 Ascher H Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:53
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0284; G11B17/021; G11B17/32; G11B23/00; G11B23/02; G11B23/021; G11B25/00; G11B25/04; G11B25/043; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/74; G11B5/82; G11B5/825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A MAGNETIC RECORDER UTILIZING A FLEXIBLE RECORDING DISC AND A PLURALITY OF MAGNETIC TRANSDUCERS, EACH ONE OF THE MAGNETIC TRANSDUCERS HAING SUBSTANTIALLY THE SAME SENSITIVITY, COMPRISING, MEANS FOR MOUNTING THE FLEXIBLE RECORDING DISC AND EACH ONE OF THE PLURALITY OF MAGNETIC TRANSDUCERS IN A FLUID, THE MAGNETIC TRANSDUCERS BEING DISPOSED IN A PLANE AT DIFFERENT RADIAL DISTANCES FROM THE CENTER OF THE FLEXIBLE RECORDING DISC, MEANS FOR ROTATING THE DISC TO CREATE DYNAMIC, ELASTIC AND FLUID FORCES GO CAUSE THE DISC TO ROTATE AT A SMALL DISTANCE FROM THE PLANE, AND MEANS FOR REGULATING THE FLUID PRESSURE GRADIENT BETWEEN THE DISC AND THE PLANE TO ESABLISH AN EQUILIBRIUM CONDITION BETWEEN THE DYNAMIC, ELASTIC AND FLUID FORCES ON THE DISC WHEREIN THE SPACING BETWEEN EACH ONE OF THE MAGNETIC TRANSDUCERS AND THE SURFACE OF THE DISC IS DIRECTLY PROPORTIONAL TO THE RADIAL DISTANCE OF EACH ONE OF THE MAGNETIC TRANSDUCERS FROM THE CENTER OF THE DISC.
Claim 2
Dependent Claim
155 words
A MAGNETIC RECORDER UTILIZING A FLEXIBLE RECORDING DISC AND A PLURALITY OF MAGNETIC TRANSDUCERS, EACH ONE OF THE MAGNETIC TRANSDUCERS HAING SUBSTANTIALLY THE SAME SENSITIVITY, COMPRISING, MEANS FOR MOUNTING THE FLEXIBLE RECORDING DISC AND EACH ONE OF THE PLURALITY OF MAGNETIC TRANSDUCERS IN A FLUID, THE MAGNETIC TRANSDUCERS BEING DISPOSED IN A PLANE AT DIFFERENT RADIAL DISTANCES FROM THE CENTER OF THE FLEXIBLE RECORDING DISC, MEANS FOR ROTATING THE DISC TO CREATE DYNAMIC, ELASTIC AND FLUID FORCES GO CAUSE THE DISC TO ROTATE AT A SMALL DISTANCE FROM THE PLANE, AND MEANS FOR REGULATING THE FLUID PRESSURE GRADIENT BETWEEN THE DISC AND THE PLANE TO ESABLISH AN EQUILIBRIUM CONDITION BETWEEN THE DYNAMIC, ELASTIC AND FLUID FORCES ON THE DISC WHEREIN THE SPACING BETWEEN EACH ONE OF THE MAGNETIC TRANSDUCERS AND THE SURFACE OF THE DISC IS DIRECTLY PROPORTIONAL TO THE RADIAL DISTANCE OF EACH ONE OF THE MAGNETIC TRANSDUCERS FROM THE CENTER OF THE DISC.
References Cited (Backward Citations)
US2899260A
Cited
US3131395A
Cited
US2950353A
Cited
US3108259A
Cited
US3047869A
Cited
US3122727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |