Patent US3135890A successfully refreshed from Google Patents.
US3135890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible connection between cathode and plural section focusing electrode
Assignee: Varian Medical Systems Inc
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Filing: 1961-02-09
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Granted: 1964-06-02
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Expires: 1981-02-09
Abstract
No abstract record available.
Inventors
- 👤 Heil Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:36
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
AN ELECTRON GUN COMPRISING A CATHODE INCLUDING A DISH-SHAPED EMITTING SURFACE, AN ANODE, AND A FOCUSING ELECTRODE, SAID FOCUSING ELECTRODE COMPRISING A PLURALITY OF ARCUATE SEGMENTS SPACED SLIGHTLY APART AT THEIR ENDS, AND MEANS CONNECTING SAID SEGMENTS TO THE RIM OF SAID
Claim 2
Dependent Claim
42 words
AN ELECTRON GUN COMPRISING A CATHODE INCLUDING A DISH-SHAPED EMITTING SURFACE, AN ANODE, AND A FOCUSING ELECTRODE, SAID FOCUSING ELECTRODE COMPRISING A PLURALITY OF ARCUATE SEGMENTS SPACED SLIGHTLY APART AT THEIR ENDS, AND MEANS CONNECTING SAID SEGMENTS TO THE RIM OF SAID
References Cited (Backward Citations)
US2888605A
Cited
US2919381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |