Patent US3307241A successfully refreshed from Google Patents.
US3307241A
Expired / Lapsed
US
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Process for making cathodes
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1963-10-14
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Granted: 1967-03-07
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Crapuchettes Paul Wythe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:02
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE PROCESS FOR PREPARING A CATHODE FOR AN ELECTRON DISCHARGE DEVICE WHICH COMPRISES THE STEPS OF DRAWING A REFRACTORY METAL CUP HAVING EXTERNAL DIMENSIONS AT AT LEAST ITS EMITTING PORTIONS SLIGHTLY SMALLER THAN THE CATHODE TO BE PREPARED, FLAME-SPRAYING A MATRIX OF TUNGSTEN ON SAID CUP IN SUCH AMOUNTS AS TO BRING THE CATHODE UP TO SIZE, VACUUM-FIRING SAID SPRAYED CUP TO REMOVE ANY IMPURITIES FROM SAID TUNGSTEN, AND IMPREGNATING SAID TUNGSTEN MATRIX WITH AN ELECTRON EMITTING SUBSTANCE.
Claim 2
Dependent Claim
78 words
THE PROCESS FOR PREPARING A CATHODE FOR AN ELECTRON DISCHARGE DEVICE WHICH COMPRISES THE STEPS OF DRAWING A REFRACTORY METAL CUP HAVING EXTERNAL DIMENSIONS AT AT LEAST ITS EMITTING PORTIONS SLIGHTLY SMALLER THAN THE CATHODE TO BE PREPARED, FLAME-SPRAYING A MATRIX OF TUNGSTEN ON SAID CUP IN SUCH AMOUNTS AS TO BRING THE CATHODE UP TO SIZE, VACUUM-FIRING SAID SPRAYED CUP TO REMOVE ANY IMPURITIES FROM SAID TUNGSTEN, AND IMPREGNATING SAID TUNGSTEN MATRIX WITH AN ELECTRON EMITTING SUBSTANCE.
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |