US3658540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of photographic materials with photosensitive compounds other than silver halides
Assignee: INST PHISIKOHIMIA PRI BULGARSK
•
Filing: 1967-09-12
•
Granted: 1972-04-25
•
Expires: 1987-09-12
Abstract
Abstract A method of making a photographic material in which a photosensitive semiconductor layer is applied to the substrate and a thin, radiation-permeable layer is deposited thereon to stabilize the image formed upon radiation of the material.
Inventors
- 👤 Jordan P Malinowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/705
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
The method defined in claim 1 wherein said compound is selected from the group which consists of the halides, oxides, selenides, sulphides, and tellurides of lead, tellurium metals of groups I and II of the periodic table, intermetallic compounds and the elements of group III and group V of the periodic table, said layer of said compound having a thickness between 0.1 and 10 microns.
Claim 2
Dependent Claim
46 words
The method defined in claim 2 wherein said metal is selected from the group which consists of silver, bismuth, cadmium, chromium, copper, iron, indium, lead, selenium and tellurium and is applied in a layer in an amount between 10 8 and 10 5 grams per cm2.
Claim 3
Dependent Claim
39 words
The method defined in claim 3 wherein said layer of said compound is provided in a thickness between 0.3 and 1 micron and said layer of metal is provided in an amount of about 10 7 grams per cm2.
Claim 4
Dependent Claim
52 words
The method defined in claim 1 wherein said compound consists of at least two elements with a band gap greater than 1 electron volt formed and selected from the group which consists of cadmium antimonide, indium antimonide and lead sulphides, said layer of metal being composed of silver, bismuth, indium or lead.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |