US3243639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic apparatus for focusing electron beams
Assignee: AT&T Inc
•
Filing: 1961-10-04
•
Granted: 1966-03-29
•
Expires: 1981-10-04
Abstract
No abstract record available.
Inventors
- 👤 Myron S Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:49
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0873
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
AN ELECTRON DISCHARGE DEVICE COMPRISING MEANS FOR FORMING AND PROJECTING A BEAM OF ELECTRONS ALONG A PATH; MEANS FOR FOCUSING SAID BEAM COMPRISING A CYLINDRICAL MAGNET SURROUNDING A PORTION OF SAID PATH; A FERROMAGNETIC CYLINDER SURROUNDING SAID MAGNET AND COAXIAL THEREWITH; AND A POLE PIECE AT EACH END OF SAID CYLINDER; THE DISTANCE BETWEEN SAID MAGNET AND EACH OF SAID POLE PIECES BEING SUBSTANTIALLY EQUAL TO HALF THE AXIAL LENGTH OF SAID MAGNET.
Claim 2
Dependent Claim
73 words
AN ELECTRON DISCHARGE DEVICE COMPRISING MEANS FOR FORMING AND PROJECTING A BEAM OF ELECTRONS ALONG A PATH; MEANS FOR FOCUSING SAID BEAM COMPRISING A CYLINDRICAL MAGNET SURROUNDING A PORTION OF SAID PATH; A FERROMAGNETIC CYLINDER SURROUNDING SAID MAGNET AND COAXIAL THEREWITH; AND A POLE PIECE AT EACH END OF SAID CYLINDER; THE DISTANCE BETWEEN SAID MAGNET AND EACH OF SAID POLE PIECES BEING SUBSTANTIALLY EQUAL TO HALF THE AXIAL LENGTH OF SAID MAGNET.
References Cited (Backward Citations)
US2867744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |