US3299306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phototube having a photocathode adapted to absorb substantially all the light energyreceived
Assignee: Optics Tech Inc
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Filing: 1964-07-23
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Granted: 1967-01-17
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Expires: 1984-07-23
Abstract
No abstract record available.
Inventors
- 👤 Narinder S Kapany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:02
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PHOTOTUBE COMPRISING A FIRST LIGHT TRANSMITTING MEDIUM HAVING A GIVEN REFRACTIVE INDEX; A LIGHT TRANSMITTING AND ABSORBING CATHODE LAYER BOUNDING AT LEAST A PORTION OF SAID FIRST MEDIUM; AND ANODE SPACED FROM SAID CATHODE; A SECOND MEDIUM BETWEEN SAID CATHODE AND SAID ANODE HAVING A REFRACTIVE INDEX LOWER THAN SAID INDEX OF SAID FIRST MEDIUM; MEANS FOR ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID CATHODE LAYER AND SAID ANODE; MEANS FOR INTRODUCING LIGHT INTO SAID FIRST MEDIUM TO PENETRATE SAID CATHODE AND ENTER THE CATHODE AT AN ANGLE AT LEAST AS GREAT AS THE TRAPPING ANGLE WHICH PREVENTS LIGHT FROM PASSING INTO SAID SECOND MEDIUM, THE BOUNDARIES OF SAID FIRST MEDIUM ARRANGED TO REDIRECT LIGHT THAT IS REFLECTED FROM SAID CATHODE BACK TO SAID CATHODE AT AN ANGLE AT LEAST AS GREAT AS SAID TRAPPING ANGLE.
Claim 2
Dependent Claim
136 words
A PHOTOTUBE COMPRISING A FIRST LIGHT TRANSMITTING MEDIUM HAVING A GIVEN REFRACTIVE INDEX; A LIGHT TRANSMITTING AND ABSORBING CATHODE LAYER BOUNDING AT LEAST A PORTION OF SAID FIRST MEDIUM; AND ANODE SPACED FROM SAID CATHODE; A SECOND MEDIUM BETWEEN SAID CATHODE AND SAID ANODE HAVING A REFRACTIVE INDEX LOWER THAN SAID INDEX OF SAID FIRST MEDIUM; MEANS FOR ESTABLISHING A POTENTIAL DIFFERENCE BETWEEN SAID CATHODE LAYER AND SAID ANODE; MEANS FOR INTRODUCING LIGHT INTO SAID FIRST MEDIUM TO PENETRATE SAID CATHODE AND ENTER THE CATHODE AT AN ANGLE AT LEAST AS GREAT AS THE TRAPPING ANGLE WHICH PREVENTS LIGHT FROM PASSING INTO SAID SECOND MEDIUM, THE BOUNDARIES OF SAID FIRST MEDIUM ARRANGED TO REDIRECT LIGHT THAT IS REFLECTED FROM SAID CATHODE BACK TO SAID CATHODE AT AN ANGLE AT LEAST AS GREAT AS SAID TRAPPING ANGLE.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |