US3247495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary readout of a magnetic tape utilizing the deflection of an electron passing therethrough
Assignee: Laboratory For Electronics Inc
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Filing: 1961-10-02
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Granted: 1966-04-19
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Expires: 1981-10-02
Abstract
No abstract record available.
Inventors
- 👤 Harrison W Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:30
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/115; H; H01; H01J; H01J37/00; H01J37/26; H01J37/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
APPARATUS FOR DETERMINING THE MAGNETIC STATE OF UNIT VOLUMES OF A MAGNETIC FILM, COMPRISING: (A) MEANS FOR GENERATING AN ELECTRON BEAM; (B) MEANS FOR SCANNING THE ELECTRON BEAM ACROSS A SURFACE OF THE FILM TO CHANGE, UPON PASSING THROUGH THE FILM, THE DIRECTION OF SUCH BEAM FROM A FIRST TO A SECOND DIRECTION IN ACCORDANCE WITH THE MAGNETIC STATE OF EACH UNIT VOLUME OF THE FILM; (C) MEANS FOR FOCUSSING, AT A FIRST FOCAL POINT IN A FOCAL PLANE, ELECTRONS TRAVELLING IN THE FIRST DIRECTION AND, AT A SECOND FOCAL POINT IN THE FOCAL PLANE, ELECTRONS TRAVELLING IN THE SECOND DIRECTION; AND, (D) MEANS FOR DERIVING A CONTINUOUS ELECTRIC SIGNAL PROPORTIONAL TO THE DIFFERENCE IN THE NUMBER OF ELECTRONS IMPINGING ON THE FIRST AND THE SECOND FOCAL POINT.
Claim 2
Dependent Claim
128 words
APPARATUS FOR DETERMINING THE MAGNETIC STATE OF UNIT VOLUMES OF A MAGNETIC FILM, COMPRISING: (A) MEANS FOR GENERATING AN ELECTRON BEAM; (B) MEANS FOR SCANNING THE ELECTRON BEAM ACROSS A SURFACE OF THE FILM TO CHANGE, UPON PASSING THROUGH THE FILM, THE DIRECTION OF SUCH BEAM FROM A FIRST TO A SECOND DIRECTION IN ACCORDANCE WITH THE MAGNETIC STATE OF EACH UNIT VOLUME OF THE FILM; (C) MEANS FOR FOCUSSING, AT A FIRST FOCAL POINT IN A FOCAL PLANE, ELECTRONS TRAVELLING IN THE FIRST DIRECTION AND, AT A SECOND FOCAL POINT IN THE FOCAL PLANE, ELECTRONS TRAVELLING IN THE SECOND DIRECTION; AND, (D) MEANS FOR DERIVING A CONTINUOUS ELECTRIC SIGNAL PROPORTIONAL TO THE DIFFERENCE IN THE NUMBER OF ELECTRONS IMPINGING ON THE FIRST AND THE SECOND FOCAL POINT.
References Cited (Backward Citations)
US3059538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |