US3172962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Netic drum
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
RECORDING AND REPRODUCING APPARATUS COMPRISING IN COMBINATION: A ROTARY MAGNETIC STORAGE DRUM ADAPTED TO ROTATE ABOUT A SHAFT, A MAGNETIC TRANSDUCER MAGNETICALLY COACTING WITH THE SURFACE OF THE DRUM, SUPPORTING MEANS FOR SUPPORTING SAID TRANSDUCER, BIAS MEANS URGING SAID TRANSDUCER TOWARDS THE DRUM SURFACE, A STATIONARY PIVOT POINT, A LEVER HAVING TWO ARMS, SAID ARMS BEING PIVOTED ABOUT SAID PIVOT POINT, AN EXPANSIBLE MEMBER HAVING A FIXED EDGE AND A MOVABLE EDGE, AN OPEN-ENDED TUBE, ONEEND OF THE TUBE COMMUNICATING WITH INTERIOR OF THE EXPANSIBLE MEMBER, THE OTHER END BEING POSITIONED ADJACENT TO AND COACTING WITH SAID FLUID MEDIUM WITH PART OF THE FLUID MEDIUM BEING FORCED INTO THE EXPANSIBLE MEMBER THROUGH THE TUBE CAUSING THE MOVABLE EDGE TO MOVE WHEN THE DRUM IS ROTATING, ONE OF SAID ARMS RESTING ON SAID MOVABLE EDGE, THE OTHER ARM COACTING WITH SAID SUPPORTING MEANS AND MAINTAINING SAID TRANSDUCER IN A POSI-
References Cited (Backward Citations)
US2937240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |