US3197665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun with positioner for emissive surface of cathode
Assignee: RCA Corp
•
Filing: 1962-05-11
•
Granted: 1965-07-27
•
Expires: 1982-05-11
Abstract
No abstract record available.
Inventors
- 👤 Cope Appleton Danforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:28
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/487
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
A TELEVISION PICKUP TUBE COMPRISING: (A) AN ELONGATED ENVELOPE HAVING AN AXIS; (B) AN ELECTRON GUN SUBSTANTIALLY ON SAID AXIS; (C) SAID ELECTRON GUN INCLUDING A TUBULAR CATHODE HAVING A CLOSE END AND AN OPEN END; (D) SAID CLOSED END BEING SUBSTANTIALLY HEMISPHERICAL IN SHAPE AND HAVING AN ELECTRON EMISSIVE COATING THEREON; (E) A HOLLOW TUBULAR CONTROL ELECTRODE POSITIONED SUBSTANTIALLY COAXIALLY AROUND SAID TUBULAR CATHODE; (F) SAID CONTROL ELECTRODE HAVING AN END POSITIONED STANTIALLY NORMAL TO SAID AXIS AND HAVING AN APERTURE THEREIN; AND, (G) DIFFERENTIAL HEATING MEANS FOR POSITIONING A SELECTED AREA OF SAID CLOSED END OF SAID CATHODE ADJACENT TO THERE APERTURE IN SAID CONTROL ELECTRODE, SAID DIFFERENTIAL HEATING MEANS COMPRISING: A PLURALITY OF HEATERS ADAPTED TO BE INDEPENDENTLY ENERGIZED AND CIRCUMFERENTIALLY SPACED AROUND THE INNER PERIPHERY OF SAID TUBULAR CATHODE.
References Cited (Backward Citations)
US2391780A
Cited
US2506660A
Cited
CH256966A
Cited
US2735031A
Cited
US2850658A
Cited
US2963608A
Cited
US3034012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |