Patent US3223871A successfully refreshed from Google Patents.
US3223871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron optical system
Assignee: General Electric Co
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Filing: 1961-08-22
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Granted: 1965-12-14
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Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Schlesinger Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:38
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN ELECTRON OPTICAL SYSTEM COMPRISING, ARRANGED IN COAXIAL RELATION, AN ELECTRON BEAM SOURCE, A TARGET SPACED FROM SAID SOURCE, A MAIN ELECTRON BEAM FOCUSING LENS DISPOSED BETWEEN SAID SOURCE AND SAID TARGET, AN ELECTRON BEAM PREFOCUSING ELECTRON LENS DISPOSED BETWEEN SAID ELECTRON BEAM SOURCE AND SAID TARGER FOR PROVIDING AN ELECTRON OPTICAL IMAGE OF SAID ELECTRON BEAM SOURCE FOR IMAGING ON SAID TARGET BY SAID MAIN FOCUSING LENS, AND ACCELERATING SPIRAL ELECTRODE MEANS FOR PROVIDING AN AXIAL ELECTRON ACCELERATING FIELD BETWEEN SAID PREFOCUSING LENS AND SAID MAIN LENS, AND MEANS FOR VARYING THE STRENGTH
Claim 2
Dependent Claim
94 words
AN ELECTRON OPTICAL SYSTEM COMPRISING, ARRANGED IN COAXIAL RELATION, AN ELECTRON BEAM SOURCE, A TARGET SPACED FROM SAID SOURCE, A MAIN ELECTRON BEAM FOCUSING LENS DISPOSED BETWEEN SAID SOURCE AND SAID TARGET, AN ELECTRON BEAM PREFOCUSING ELECTRON LENS DISPOSED BETWEEN SAID ELECTRON BEAM SOURCE AND SAID TARGER FOR PROVIDING AN ELECTRON OPTICAL IMAGE OF SAID ELECTRON BEAM SOURCE FOR IMAGING ON SAID TARGET BY SAID MAIN FOCUSING LENS, AND ACCELERATING SPIRAL ELECTRODE MEANS FOR PROVIDING AN AXIAL ELECTRON ACCELERATING FIELD BETWEEN SAID PREFOCUSING LENS AND SAID MAIN LENS, AND MEANS FOR VARYING THE STRENGTH
References Cited (Backward Citations)
US2318423A
Cited
US2520813A
Cited
US2630544A
Cited
GB735463A
Cited
US2914675A
Cited
US2986668A
Cited
US2995676A
Cited
US3040205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |