Patent US3259790A successfully refreshed from Google Patents.
US3259790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam tube and magnetic circuit therefor
Assignee: Varian Medical Systems Inc
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Filing: 1961-08-31
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Granted: 1966-07-05
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Expires: 1981-08-31
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Goldfinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:20
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/06; H01J23/065; H01J25/00; H01J25/02; H01J25/10; H01J25/12; H01J3/00; H01J3/02; H01J3/029
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
ELECTRON BEAM GENERATING APPARATUS COMPRISING A BEAM TUBE HAVING AN ELECTRON GUN INCLUDING AN ENERGIZABLE CATHODE AND ANODE TO PROJECT AND ACCELERATE A BEAM OF ELECTRONS AND A COLLECTOR ELECTRODE TO INTERCEPT THE BEAM, A MAGNETIC FRAME ABOUT THE TUBE BETWEEN THE ELECTRON GUN AND COLLECTOR HAVING FIRST AND SECOND APERTURED FERROMAGNETIC POLE PIECES ADJACENT THE ELECTRON GUN AND COLLECTOR, RESPECTIVELY, AND INCLUDING MAGNETIC MEANS ESTABLISHING LINES OF MAGNETIC FORCE BETWEEN THE CATHODE AND SAID FIRST POLE PIECE, MEANS ASSOCIATED WITH THE ELECTRON GUN ON THE SIDE OF SAID ANODE REMOTE FROM SAID FIRST APERTURED POLE PIECE AND COOPERATING WITH SAID FIRST APERTURED POLE PIECE TO CONTROL THE PATTERN OF DISTRIBUTION OF SAID LINES OF MAGNETIC FORCE, AND SAID FIRST APERTURED POLE PIECE COMPRISING A FIRST PORTION FIXED WITH RESPECT TO THE TUBE AND A SECOND PORTION SELECTIVELY MOVABLE WITH RESPECT TO SAID MEANS ASSOCIATED WITH THE ELECTRON GUN.
Claim 2
Dependent Claim
149 words
ELECTRON BEAM GENERATING APPARATUS COMPRISING A BEAM TUBE HAVING AN ELECTRON GUN INCLUDING AN ENERGIZABLE CATHODE AND ANODE TO PROJECT AND ACCELERATE A BEAM OF ELECTRONS AND A COLLECTOR ELECTRODE TO INTERCEPT THE BEAM, A MAGNETIC FRAME ABOUT THE TUBE BETWEEN THE ELECTRON GUN AND COLLECTOR HAVING FIRST AND SECOND APERTURED FERROMAGNETIC POLE PIECES ADJACENT THE ELECTRON GUN AND COLLECTOR, RESPECTIVELY, AND INCLUDING MAGNETIC MEANS ESTABLISHING LINES OF MAGNETIC FORCE BETWEEN THE CATHODE AND SAID FIRST POLE PIECE, MEANS ASSOCIATED WITH THE ELECTRON GUN ON THE SIDE OF SAID ANODE REMOTE FROM SAID FIRST APERTURED POLE PIECE AND COOPERATING WITH SAID FIRST APERTURED POLE PIECE TO CONTROL THE PATTERN OF DISTRIBUTION OF SAID LINES OF MAGNETIC FORCE, AND SAID FIRST APERTURED POLE PIECE COMPRISING A FIRST PORTION FIXED WITH RESPECT TO THE TUBE AND A SECOND PORTION SELECTIVELY MOVABLE WITH RESPECT TO SAID MEANS ASSOCIATED WITH THE ELECTRON GUN.
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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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |