US3100260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron lens for reduction of spherical aberration
Assignee: Philips Electronics and Pharmaceutical Industries Corp
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Filing: 1961-11-15
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Granted: 1963-08-06
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Expires: 1981-11-15
Abstract
No abstract record available.
Inventors
- 👤 Alvar P Wilska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:06
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J37/00; H01J37/02; H01J37/04; H01J37/10; H01J37/14; H01J37/141; H01J37/153
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
IN AN ELECTRON BEAM DEVICE IN WHICH THE ELECTRON BEAM TRAVELS ALONG A BEAM AXIS, AN ELECTRON LENS ON SAID AXIS COMPRISING: MEANS FOR FORMING A SUBSTANTIALLY ROTATIONALLY SYMMETRIC MAGNETIC FIELD ON SAID AXIS; A CYLINDRICAL CENTRAL ELECTRODE WITHIN SAID FIELD AND COAXIAL WITH SAID BEAM AXIS; A FIRST ANNULAR ELECTRODE CONCENTRICALLY SPACED FROM SAID CENTRAL ELECTRODE AND COAXIAL THEREWITH AND NEGATIVELY ELECTRICALLY POLARIZED WITH RESPECT TO SAID CENTRAL ELECTRODE; AND A SECOND ANNULAR ELECTRODE COMPRISING A FIRST ANNULAR PORTION AXIALLY SPACED FROM SAID FIRST ANNULAR ELECTRODE IN ONE DIRECTION ALONG SAID BEAM AXIS AND A SECOND ANNULAR PORTION AXIALLY SPACED FROM SAID FIRST ANNULAR ELECTRODE IN THE OPPOSITE DIRECTION ALONG SAID BEAM AXIS, SAID SECOND ANNULAR ELECTRODE HAVING SUBSTANTIALLY THE SAME ELECTRICAL POTENTIAL AS SAID CENTRAL ELECTRODE AND BEING COAXIAL THEREWITH.
References Cited (Backward Citations)
US2862129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |