Patent US3381157A successfully refreshed from Google Patents.
US3381157A
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Annular hollow cathode discharge apparatus
Assignee: RTX Corp
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Filing: 1964-12-10
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Granted: 1968-04-30
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Expires: 1984-12-10
Abstract
No abstract record available.
Inventors
- 👤 Fernand J Ferreira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/06; H01J37/077; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN A HOLLOW CATHODE DEVICE FOR PRODUCING AN ELECTRON BEAM, A CATHODE STRUCTURE COMPRISING A HOLLOW METALLIC ELEMENT CONTAINING A CONTINUOUS ELONGATED APERTURE ALONG AT LEAST A PORTION OF THE SURFACE THEREOF, AND MEANS FOR CAUSING SAID CATHODE STRUCTURE TO EMIT FROM THE SAID APERTURE A PLANE-COLLIMATED UNINTERRUPTED SHEET OF ELECTRONS BY NONTHERMIONIC DISCHARGE, SAID APERTURE BEING CURVED IN THE PLANE CONTAINING SAID SHEET OF ELECTRONS.
Claim 2
Dependent Claim
66 words
IN A HOLLOW CATHODE DEVICE FOR PRODUCING AN ELECTRON BEAM, A CATHODE STRUCTURE COMPRISING A HOLLOW METALLIC ELEMENT CONTAINING A CONTINUOUS ELONGATED APERTURE ALONG AT LEAST A PORTION OF THE SURFACE THEREOF, AND MEANS FOR CAUSING SAID CATHODE STRUCTURE TO EMIT FROM THE SAID APERTURE A PLANE-COLLIMATED UNINTERRUPTED SHEET OF ELECTRONS BY NONTHERMIONIC DISCHARGE, SAID APERTURE BEING CURVED IN THE PLANE CONTAINING SAID SHEET OF ELECTRONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |