Patent US3213461A successfully refreshed from Google Patents.
US3213461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bearing head
Assignee: International Business Machines Corp
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Filing: 1954-01-25
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Granted: 1965-10-19
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 William A Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A RECORDING DEVICE COMPRISING IN COMBINATION A RECORDING MEDIUM, A MAGNETIC TRANSDUCER ELEMENT, A RECORDING HEAD FOR SUPPORTING SAID ELEMENT AND POSITIONABLE ADJACENT SAID MEDIUM, MEANS INCLUDING A PLURALITY OF INLET VENTS DISPOSED AROUND SAID ELEMENT FOR SUPPLYING FLUID FLOW BETWEEN SAID MEDIUM AND SAID HEAD RESULTING IN PRESSURE AREAS BELOW AND ABOVE AMBIENT PRESSURE, SAID AREAS OF BELOW AMBIENT PRESSURE CAUSING A FIRST FORCE URGING SAID MEDIUM AND SAID HEAD TOGTHER AND SAID AREAS OF ABOVE AMBIENT PRESSURE CAUSING A SECOND FORCE SMALLER THAN SAID FIRST FORCE URGING SAID MEDIUM AND SAID HEAD APART, AND AN OUTLET VENT PASSAGE EXTENDING BETWEEN AN AREA OF HIGH PRESSURED DEFINED BY SAID INLET VENTS AND AN AREA OF AMBIENT PRESSURE TO REDUCE SAID SECOND FORCE WHEREBY SAID FIRST FORCE CAUSES A CLOSER SPACING BETWEEN SAID MEDIUM AND SAID HEAD.
Claim 2
Dependent Claim
137 words
A RECORDING DEVICE COMPRISING IN COMBINATION A RECORDING MEDIUM, A MAGNETIC TRANSDUCER ELEMENT, A RECORDING HEAD FOR SUPPORTING SAID ELEMENT AND POSITIONABLE ADJACENT SAID MEDIUM, MEANS INCLUDING A PLURALITY OF INLET VENTS DISPOSED AROUND SAID ELEMENT FOR SUPPLYING FLUID FLOW BETWEEN SAID MEDIUM AND SAID HEAD RESULTING IN PRESSURE AREAS BELOW AND ABOVE AMBIENT PRESSURE, SAID AREAS OF BELOW AMBIENT PRESSURE CAUSING A FIRST FORCE URGING SAID MEDIUM AND SAID HEAD TOGTHER AND SAID AREAS OF ABOVE AMBIENT PRESSURE CAUSING A SECOND FORCE SMALLER THAN SAID FIRST FORCE URGING SAID MEDIUM AND SAID HEAD APART, AND AN OUTLET VENT PASSAGE EXTENDING BETWEEN AN AREA OF HIGH PRESSURED DEFINED BY SAID INLET VENTS AND AN AREA OF AMBIENT PRESSURE TO REDUCE SAID SECOND FORCE WHEREBY SAID FIRST FORCE CAUSES A CLOSER SPACING BETWEEN SAID MEDIUM AND SAID 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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |