Patent US3143681A successfully refreshed from Google Patents.
US3143681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral electrostatic electron lens
Assignee: General Electric Co
•
Filing: 1959-12-07
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Granted: 1964-08-04
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Expires: 1979-12-07
Abstract
No abstract record available.
Inventors
- 👤 Schlesinger Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:21
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A CATHODE RAY TUBE, MEANS FOR GENERATING AN ELECTRON BEAM DIRECTED ALONG A REFERENCE AXIS, MEANS FOR DEFLECTING THE ELECTRON BEAM IN DIRECTIONS NORMAL TO THE AXIS, ELECTRODE MEANS SURROUNDING THE AXIS FOR GENERATING AN ELECTROSTATIC FIELD HAVING EQUIPOTENTIAL SURFACES WHICH ARE COSYMPTOTIC HYPERBOLIDS SYMMETRICAL WITH THE AXIS, SAID ELECTRODE MEANS INCLUDING A CONTINOUS SPIRAL CONDUCTIVE STRIP SYMMETRICAL WITH THE AXIS AND HAVING A NONUNIFORM PITCH, AND AN APERTURED ELECTRON BEAM CONDUCTIVE MEMBER HAVING A SUBSTANTIALLY UNIFORM SURFACE POTENTIAL DISPOSED IN THE PATH OF THE ELECTRON BEAM BETWEEN THE
Claim 2
Dependent Claim
90 words
IN A CATHODE RAY TUBE, MEANS FOR GENERATING AN ELECTRON BEAM DIRECTED ALONG A REFERENCE AXIS, MEANS FOR DEFLECTING THE ELECTRON BEAM IN DIRECTIONS NORMAL TO THE AXIS, ELECTRODE MEANS SURROUNDING THE AXIS FOR GENERATING AN ELECTROSTATIC FIELD HAVING EQUIPOTENTIAL SURFACES WHICH ARE COSYMPTOTIC HYPERBOLIDS SYMMETRICAL WITH THE AXIS, SAID ELECTRODE MEANS INCLUDING A CONTINOUS SPIRAL CONDUCTIVE STRIP SYMMETRICAL WITH THE AXIS AND HAVING A NONUNIFORM PITCH, AND AN APERTURED ELECTRON BEAM CONDUCTIVE MEMBER HAVING A SUBSTANTIALLY UNIFORM SURFACE POTENTIAL DISPOSED IN THE PATH OF THE ELECTRON BEAM BETWEEN THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |