US3837815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reclaiming selenium and metal base from electrophotographic plates
Assignee: AB Dick Co
•
Filing: 1973-03-29
•
Granted: 1974-09-24
•
Expires: 1993-03-29
Abstract
Abstract A method for separating a coating, such as of selenium, from the smooth surface of a base material such as a metal electrophotographic plate comprising rapidly reducing the temperature of the coated base metal to far below freezing temperature of water, wetting the coated surface of the refrigerated base metal with a liquid such as water which forms a frozen layer such as ice on the coated side of the base metal, and then applying heat to effect separation of the frozen layer from the base metal with the coating adhered to the separated frozen layer, and wherein the coating material is separated as a solid from the liquid phase of the removed frozen layer.
Inventors
- 👤 W Bixby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:57
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207; G03G5/005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
The method as claimed in claim 1 in which the selenium coated metal based element is rapidly reduced to a temperature below -50*C.
Claim 2
Dependent Claim
28 words
The method as claimed in claim 1 in which the selenium coated element is rapidly reduced in temperature by immersing the element in a bath of liquid nitrogen.
Claim 3
Dependent Claim
23 words
The method as claimed in claim 3 in which the selenium coated element is maintained in the bath until vigorous boiling substantially ceases.
Claim 4
Dependent Claim
33 words
The method as claimed in claim 1 in which the refrigerated element is wetted with water at least on the selenium coated surface to form an ice layer on the selenium coated surface.
Claim 5
Dependent Claim
30 words
The method as claimed in claim 5 in which the ice layer is formed on the selenium coated surface by immersing the refrigerated element in a body of cold water.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 5 in which the ice layer is formed by flowing a stream of cold water onto the selenium coated surface of the element.
Claim 7
Dependent Claim
22 words
The method as claimed in claim 5 in which the ice layer is formed by spraying the selenium coated surface with water.
Claim 8
Dependent Claim
50 words
The method as claimed in claim 1 in which the refrigerated element is wetted with the water for a time sufficient to form the ice layer but insufficient to effect material increase in the temperature of the metal base whereby the metal base remains at a temperature considerably below freezing.
Claim 9
Dependent Claim
43 words
The method as claimed in claim 9 which includes the step of holding the ice coated metal base for a period of time sufficient to enable cold to transfer from the cold metal base to the ice layer to super-cool the ice layer.
Claim 10
Dependent Claim
27 words
The method as claimed in claim 1 in which the temperature is raised by wetting the selenium coated side of the element with water above freezing temperature.
Claim 11
Dependent Claim
29 words
The method as claimed in claim 1 in which the temperature is raised by wetting the side of the element opposite the selenium coating with water above freezing temperature.
Claim 12
Dependent Claim
41 words
The method as claimed in claim 1 which includes the step of allowing the separated ice layer to melt to the liquid phase having the separated selenium present as a solid therein, and then separating the solid selenium from the water.
References Cited (Backward Citations)
US3419427A
Cited
US3415684A
Cited
US3446642A
Cited
US3527414A
Cited
US3768739A
Cited
US3720506A
Cited
US3713592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |