US3006786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-emissive surfaces
Assignee: EMI Ltd
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Filing: 1958-12-01
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Granted: 1961-10-31
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Expires: 1978-12-01
Abstract
No abstract record available.
Inventors
- 👤 Sjoberg Eric James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/04; H01J40/06; H01J29/00; H01J29/02; H01J29/08; H01J29/10; H01J29/36; H01J29/38; H01J9/00; H01J9/02; H01J9/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A METHOD OF MAKING A PHOTO-EMISSIVE SURFACE WHICH COMPRISES DEPOSITING TELLURIUM ONTO A SURFACE, SENSITISING SAID TELLURIUM BY DEPOSITING THEREON AN ALKALI METAL, DEPOSITING THEREON A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ANTIMONY, A COMPOUND THEREOF AND AN ALLOY THEREOF AND THEN SENSITISING SAID SUBSTANCE BY THE DEPOSITION THEREON OF AT LEAST TWO ALKALI METALS ALL OF SAID ALKALI METALS BEING DIFFERENT.
References Cited (Backward Citations)
US2770561A
Cited
US2847329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |