Patent US3137802A successfully refreshed from Google Patents.
US3137802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen raster photocathode having photoemissive and secondary emissive properties
Assignee: Individual
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Filing: 1960-11-23
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Granted: 1964-06-16
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Expires: 1980-11-23
Abstract
No abstract record available.
Inventors
- 👤 Radames K H Gebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:13
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PHOTOCATHODE FOR A TELEVISION PICKUP TUBE CAPABLE OF BOTH PHOTOEMISSION AND SECONDARY EMISSION, SAID PHOTOCATHODE COMPRISING: A FIRST PHOTO-SECONDARY EMITTER ELECTRODE HAVING A PLURALITY OF OPENINGS, A SECOND PHOTO-SECONDARY EMITTER ELECTRODE HAVING A PLURALITY OF OPENINGS SPACED FROM THE SAID FIRST ELECTRODE, THE SURFACE OF SAID SECOND ELECTRODE MATCHING THE OPENINGS IN SAID FIRST ELECTRODE SUCH THAT ALL LIGHT ENTERING THE FACE OF SAID PICKUP TUBE WILL STRIKE SAID PHOTOCATHODE, AND EACH OF SAID ELECTRODES INCLUDING A BACKING OF ALUMINUM AND A THIN LAYER OF PHOTO-SECONDARY EMITTING MATERIAL.
Claim 2
Dependent Claim
89 words
A PHOTOCATHODE FOR A TELEVISION PICKUP TUBE CAPABLE OF BOTH PHOTOEMISSION AND SECONDARY EMISSION, SAID PHOTOCATHODE COMPRISING: A FIRST PHOTO-SECONDARY EMITTER ELECTRODE HAVING A PLURALITY OF OPENINGS, A SECOND PHOTO-SECONDARY EMITTER ELECTRODE HAVING A PLURALITY OF OPENINGS SPACED FROM THE SAID FIRST ELECTRODE, THE SURFACE OF SAID SECOND ELECTRODE MATCHING THE OPENINGS IN SAID FIRST ELECTRODE SUCH THAT ALL LIGHT ENTERING THE FACE OF SAID PICKUP TUBE WILL STRIKE SAID PHOTOCATHODE, AND EACH OF SAID ELECTRODES INCLUDING A BACKING OF ALUMINUM AND A THIN LAYER OF PHOTO-SECONDARY EMITTING MATERIAL.
References Cited (Backward Citations)
US2254617A
Cited
US2249016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |