US3031740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix type cathode
Assignee: Varian Medical Systems Inc
•
Filing: 1958-03-12
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Granted: 1962-05-01
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Expires: 1978-03-12
Abstract
No abstract record available.
Inventors
- 👤 Robert D Culbertson
- 👤 Russell C Mcrae
- 👤 Lowell A Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:51
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T428/12139; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A CATHODE COMPRISING A BACKING MEMBER AND AN EMMISSIVE COATING ON SAID BACKING MEMBER, SAID BACKING MEMBER BEING AT LEAST 99% NICKEL AND INCLUDING AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, MAGNESIUM, AND SILICON, THE TOTAL AMOUNT OF SAID SELECTED ELEMENTS BEING BETWEEN .05% AND 1% OF THE NICKEL, SAID EMISSIVE COATING CONSISTING ESSENTIALLY OF A
Claim 2
Dependent Claim
60 words
A CATHODE COMPRISING A BACKING MEMBER AND AN EMMISSIVE COATING ON SAID BACKING MEMBER, SAID BACKING MEMBER BEING AT LEAST 99% NICKEL AND INCLUDING AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, MAGNESIUM, AND SILICON, THE TOTAL AMOUNT OF SAID SELECTED ELEMENTS BEING BETWEEN .05% AND 1% OF THE NICKEL, SAID EMISSIVE COATING CONSISTING ESSENTIALLY OF A
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) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |