Patent US3128407A successfully refreshed from Google Patents.
US3128407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-grid assembly for electron guns
Assignee: RCA Corp
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Filing: 1960-11-14
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Granted: 1964-04-07
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Expires: 1980-11-14
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Mattson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:55
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/506; H01J29/485
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN AN ELECTRON GUN, A CATHODE-GRID ASSEMBLY COMPRISING A TUBULAR CATHODE SLEEVE CLOSED AT ONE END, A CATHODE SUPPORT SLEEVE COAXIALLY SURROUNDING SAID CATHODE SLEEVE AND FIXED TO SAID CATHODE SLEEVE AT A POINT ALONG SAID CATHODE SLEEVE LONGITUDINALLY SPACED FROM SAID ONE END, A CERAMIC WASHER HAVING A METALIZED SURFACE PORTION, SAID CATHODE SUPPORT SLEEVE BEING BRAZED TO SAID METALIZED SURFACE PORTION AT A POINT ON SAID SUPPORT SLEEVE LONGITUDINALLY SPACED FROM THE POINT THEREON AT WHICH SAID CATHODE SLEEVE IS FIXED, SAID CATHODE SLEEVE EXTENDING THROUGH THE APERTURE OF SAID WASHER, AND A GRID CUP COAXIALLY SURROUNDING AND FIXED TO SAID WASHER.
Claim 2
Dependent Claim
104 words
IN AN ELECTRON GUN, A CATHODE-GRID ASSEMBLY COMPRISING A TUBULAR CATHODE SLEEVE CLOSED AT ONE END, A CATHODE SUPPORT SLEEVE COAXIALLY SURROUNDING SAID CATHODE SLEEVE AND FIXED TO SAID CATHODE SLEEVE AT A POINT ALONG SAID CATHODE SLEEVE LONGITUDINALLY SPACED FROM SAID ONE END, A CERAMIC WASHER HAVING A METALIZED SURFACE PORTION, SAID CATHODE SUPPORT SLEEVE BEING BRAZED TO SAID METALIZED SURFACE PORTION AT A POINT ON SAID SUPPORT SLEEVE LONGITUDINALLY SPACED FROM THE POINT THEREON AT WHICH SAID CATHODE SLEEVE IS FIXED, SAID CATHODE SLEEVE EXTENDING THROUGH THE APERTURE OF SAID WASHER, AND A GRID CUP COAXIALLY SURROUNDING AND FIXED TO SAID WASHER.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |