Patent US3124660A successfully refreshed from Google Patents.
US3124660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
cmner
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
IN A READ HEAD FOR A MAGNETIC RECORDING SYSTEM INCLUDING A MOVING RECORD SURFACE, THE COMBINATION OF: A FRAME; A PISTON MOUNTED IN SAID FRAME FOR MOVEMENT TOWARD AND AWAY FROM SAID RECORD SURFACE, SAID PISTON HAVING A BACK DISPOSED WITHIN SAID FRAME AND A FACE DISPOSED ADJACENT SAID RECORD SURFACE, WITH THE DISTANCE BETWEEN SAID FACE AND RECORD SURFACE DECREASING IN THE DIRECTION OF MOTION OF SAID SURFACE; A MAGNETIC PICKUP UNIT MOUNTED IN SAID PISTON FACE; AND SPRING MEANS FOR COUPLING SAID PISTON AND FRAME, SAID FRAME HAVING A GAS FLOW PASSAGE FOR DIRECTING A SOURCE OF GAS AT SUBSTANTIALLY CONSTANT PRESSURE TO SAID PISTON BACK URGING SAID PISTON OUT OF SAID FRAME TOWARD SAID RECORD SURFACE AGAINST THE ACTION OF SAID SPRING MEANS, WHEREBY THE GAS FORCE ON SAID PISTON BACK IS BALANCED BY THE SUM OF THE FORCE EXERTED BY SAID SPRING MEANS AND THE FORCE DUE TO RELATIVE MOTION OF SAID PISTON FACE AND RECORD SURFACE.
Claim 2
Dependent Claim
161 words
IN A READ HEAD FOR A MAGNETIC RECORDING SYSTEM INCLUDING A MOVING RECORD SURFACE, THE COMBINATION OF: A FRAME; A PISTON MOUNTED IN SAID FRAME FOR MOVEMENT TOWARD AND AWAY FROM SAID RECORD SURFACE, SAID PISTON HAVING A BACK DISPOSED WITHIN SAID FRAME AND A FACE DISPOSED ADJACENT SAID RECORD SURFACE, WITH THE DISTANCE BETWEEN SAID FACE AND RECORD SURFACE DECREASING IN THE DIRECTION OF MOTION OF SAID SURFACE; A MAGNETIC PICKUP UNIT MOUNTED IN SAID PISTON FACE; AND SPRING MEANS FOR COUPLING SAID PISTON AND FRAME, SAID FRAME HAVING A GAS FLOW PASSAGE FOR DIRECTING A SOURCE OF GAS AT SUBSTANTIALLY CONSTANT PRESSURE TO SAID PISTON BACK URGING SAID PISTON OUT OF SAID FRAME TOWARD SAID RECORD SURFACE AGAINST THE ACTION OF SAID SPRING MEANS, WHEREBY THE GAS FORCE ON SAID PISTON BACK IS BALANCED BY THE SUM OF THE FORCE EXERTED BY SAID SPRING MEANS AND THE FORCE DUE TO RELATIVE MOTION OF SAID PISTON FACE AND RECORD SURFACE.
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) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |