US3275435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of production of a dispenser cathode
Assignee: General Electric Co
•
Filing: 1963-11-01
•
Granted: 1966-09-27
•
Expires: 1983-11-01
Abstract
No abstract record available.
Inventors
- 👤 Robert H Bristow
- 👤 Iii John H Affleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; B; B22; B22F; B22F3/00; B22F3/12; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF PRODUCING A DISPENSER CATHODE WHICH COMPRISES IN COMBINATION (A) PROVIDING A REFRACTORY METAL IN PARTICULATE FORM, (B) ADDING A MATERIAL TO SAID REFRACTORY METAL TO CAOT SAID REFRACTORY METAL WITH AN ADDITIVE METAL WHICH IS IN THE RANGE OF ABOUT 0.3 TO 1.0 WEIGHT PERCENT OF SAID REFRACTORY METAL, AND NOT SUBSTANTIALLY MORE THAN WILL ALLOY WITH SAID REFRACTORY METAL, (C) SAID ADDITIVE METAL INCLUDING A METAL TAKEN FROM THE CLASS CONSISTING OF THOSE METALS OF GROUP VIII OF THE PERIODIC TABLE OF ELEMENTS, (D) ADDING AT LEAST ABOUT 8.0 WEIGHT PERCENT OF A BARIUM COMPOUND TO SAID REFRACTORY METAL, (E) ADDING LESS THAN ABOUT 1.0 WEIGHT PERCENT OF CACO3 TO SAID REFRACTORY METAL, (F) COMPRESSING SAID MIXTURE AT ABOUT 10 TONS PER SQUARE INCH PRESSURE AND (G) FIRING SAID MIXTURE IN A REDUCING ATMOSPHERE AT ABOUT 1300*C. TO PROVIDE A SINTERED INTEGRAL HIGH STRENGTH DISPENSER CATHODE.
Claim 2
Independent Claim
150 words
A METHOD OF PRODUCING A DISPENSER CATHODE WHICH COMPRISES IN COMBINATION (A) PROVIDING A REFRACTORY METAL IN PARTICULATE FORM, (B) ADDING A MATERIAL TO SAID REFRACTORY METAL TO CAOT SAID REFRACTORY METAL WITH AN ADDITIVE METAL WHICH IS IN THE RANGE OF ABOUT 0.3 TO 1.0 WEIGHT PERCENT OF SAID REFRACTORY METAL, AND NOT SUBSTANTIALLY MORE THAN WILL ALLOY WITH SAID REFRACTORY METAL, (C) SAID ADDITIVE METAL INCLUDING A METAL TAKEN FROM THE CLASS CONSISTING OF THOSE METALS OF GROUP VIII OF THE PERIODIC TABLE OF ELEMENTS, (D) ADDING AT LEAST ABOUT 8.0 WEIGHT PERCENT OF A BARIUM COMPOUND TO SAID REFRACTORY METAL, (E) ADDING LESS THAN ABOUT 1.0 WEIGHT PERCENT OF CACO3 TO SAID REFRACTORY METAL, (F) COMPRESSING SAID MIXTURE AT ABOUT 10 TONS PER SQUARE INCH PRESSURE AND (G) FIRING SAID MIXTURE IN A REDUCING ATMOSPHERE AT ABOUT 1300*C. TO PROVIDE A SINTERED INTEGRAL HIGH STRENGTH DISPENSER CATHODE.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |