Patent US3615482A successfully refreshed from Google Patents.
US3615482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelable photoprocessing solutions
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1969-12-17
•
Granted: 1971-10-26
•
Expires: 1989-12-17
Abstract
Abstract Gelable photoprocessing solutions are disclosed which comprise a photoprocessing solution and an amount of heat-reversible gelforming carrageenan or furcellaran sufficient to cause gelation of the solution. These solutions are easily gelled, in which state they are useful in developing, fixing, washing, etc. exposed photographic films.
Inventors
- 👤 Alvin Cronig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/261; Y; Y10; Y10S; Y10S430/00; Y10S430/129
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
22 words
A composition of claim 1 wherein said gel former is present in an amount of less than about 5 percent by weight.
Claim 2
Dependent Claim
12 words
A composition of claim 2 wherein said gel former comprises a carrageenan.
Claim 3
Dependent Claim
13 words
A composition of claim 3 wherein said photoprocessing solution comprises a chemical developer.
Claim 4
Dependent Claim
13 words
A composition of claim 3 wherein said photoprocessing solution comprises a physical developer.
Claim 5
Dependent Claim
14 words
A composition of claim 3 wherein said photoprocessing solution coMprises a monobath developer solution.
Claim 6
Dependent Claim
86 words
A photoprocess comprising: a. heating to at least its gel critical temperature a gelable composition comprising an aqueous photoprocessing solution and an amount of a heat-reversible gel former selected from carrageenans, furcellarans and combinations of these sufficient to gel said photoprocessing solution; b. contacting a photosensitive medium with said heated gelable processing composition; c. cooling said processing composition to a temperature below its setting temperature to form a gelled processing composition on said photosensitive medium; and d. removing said gelled processing composition from the photosensitive medium.
Claim 7
Dependent Claim
17 words
A photoprocess of claim 7 wherein said heated gelable processing composition is extruded onto said photosensitive medium.
Claim 8
Dependent Claim
20 words
A photoprocess of claim 8 wherein said gelled processing composition is removed from said photosensitive medium by stripping it therefrom.
Claim 9
Independent Claim
73 words
A method of forming a heat-reversible gelled photoprocessing solution comprising: a. contacting said photoprocessing solution with an amount of a carrageenan or furcellaran gel former sufficient to gel said solution whereby a gelable solution is formed; b. heating the gelable solution to a temperature at least equal to the gel critical temperature of said gel former; and, c. subsequently cooling the mixture to a temperature below the setting temperature of said gelable mixture.
Claim 10
Dependent Claim
16 words
A method of claim 10 wherein said photoprocessing solution is contacted with a carrageenan gel former.
Claim 11
Dependent Claim
19 words
A method of claim 11 wherein the mixture is heated to a temperature of at least about 160* F.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |