US3150282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency cathode structure
Assignee: SRI International Inc
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Filing: 1962-11-13
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Granted: 1964-09-22
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Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Donovan V Geppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/312; B; B82; B82Y; B82Y10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A CATHODE STRUCTURE COMPRISING A FIRST METAL SECTION A CONTIGUOUS LARGE BAND-GAP SEMI-CONDUCTOR SECTION, A SECOND METAL SECTION CONTIGUOUS TO SAID SEMI-CONDUCTOR SECTION, AND A SURFACE LAYER FOR SAID SECOND METAL SECTION, THE METAL OF SAID FIRST SECTION BEING SELECTED TO HAVE A LOW WORK FUNCTION RELATIVE TO THE METAL OF SAID THIRD SECTION, SAID SURFACE LAYER BEING SELECTED TO BE A MATERIAL WHICH, HAS A LOW WORK FUNCTION RELATIVE TO SAID FIRST METAL SECTION.
Claim 2
Dependent Claim
75 words
A CATHODE STRUCTURE COMPRISING A FIRST METAL SECTION A CONTIGUOUS LARGE BAND-GAP SEMI-CONDUCTOR SECTION, A SECOND METAL SECTION CONTIGUOUS TO SAID SEMI-CONDUCTOR SECTION, AND A SURFACE LAYER FOR SAID SECOND METAL SECTION, THE METAL OF SAID FIRST SECTION BEING SELECTED TO HAVE A LOW WORK FUNCTION RELATIVE TO THE METAL OF SAID THIRD SECTION, SAID SURFACE LAYER BEING SELECTED TO BE A MATERIAL WHICH, HAS A LOW WORK FUNCTION RELATIVE TO SAID FIRST METAL SECTION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |