US3119037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-emissive devices
Assignee: EMI Ltd
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Filing: 1961-03-01
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Granted: 1964-01-21
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Stanley Vincent Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:33
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PHOTO-EMISSIVE DEVICE, A PHOTO-EMISSIVE CATHODE IN SAID DEVICE, A RECEIVING ELECTRODE FOR ELECTRONS, A SURFACE AROUND THE PATH OF ELECTRONS FROM SAID CATHODE TO SAID RECEIVING ELECTRODE AND CAPABLE OF EMITTING ELECTRONS WHICH GIVE RISE TO DARK CURRENT, AND A FORAMINATED ELECTRODE DISPOSED IN A PATH FROM SAID SURFACE TO SAID RECEIVING ELECTRODE BUT NOT SUBSTANTIALLY IN TH EPATH OF ELECTRONS FROM SAID CATHODE TO SAID RECEIVING ELECTRODE SO THAT THE FLOW OF DARK CURRENT FROM SAID SURFACE IS REDUCED.
Claim 2
Dependent Claim
81 words
A PHOTO-EMISSIVE DEVICE, A PHOTO-EMISSIVE CATHODE IN SAID DEVICE, A RECEIVING ELECTRODE FOR ELECTRONS, A SURFACE AROUND THE PATH OF ELECTRONS FROM SAID CATHODE TO SAID RECEIVING ELECTRODE AND CAPABLE OF EMITTING ELECTRONS WHICH GIVE RISE TO DARK CURRENT, AND A FORAMINATED ELECTRODE DISPOSED IN A PATH FROM SAID SURFACE TO SAID RECEIVING ELECTRODE BUT NOT SUBSTANTIALLY IN TH EPATH OF ELECTRONS FROM SAID CATHODE TO SAID RECEIVING ELECTRODE SO THAT THE FLOW OF DARK CURRENT FROM SAID SURFACE IS REDUCED.
References Cited (Backward Citations)
US2841728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |