US4250249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing residual-moisture photographs
Assignee: Siemens AG
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Filing: 1978-08-25
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Granted: 1981-02-10
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Expires: 1998-08-25
Abstract
Abstract For developing residual-moisture photographs according to the wet-film technique, a pre-treatment with a first solution of about 5% ethanolic NaOH is performed first at about 13° C. After the alkali exchange, the exposed film passes through a bath at a bath temperature of 50° C. with a hydroquinone-containing photographic developer. This "Two-bath wet developing method" takes place in daylight. The developed, fixed, rinsed and dried film can be evaluated directly.
Inventors
- 👤 Bernhard Montag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:06
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A method for developing residual-moisture photographs according to the wet-film technique, comprising: (a) flowing a gas against a photographic film which has been swelled in water and exposed thereby generating a residual-moisture profile on the photographic film; (b) contacting said film on which said residual-moisture profile has been generated with a 5% ethanolic sodium hydroxide solution having a temperature of about 10 to 16° C.; (c) thereafter contacting said film with a photographic developer solution having a temperature of about 50° C.; and (d) further processing said film to fix, rinse and dry the photographic half-tone image obtained upon development.
Claim 2
Independent Claim
100 words
A method for developing residual-moisture photographs according to the wet-film technique, comprising: (a) flowing a gas against a photographic film which has been swelled in water and exposed thereby generating a residual-moisture profile on the photographic film; (b) contacting said film on which said residual-moisture profile has been generated with a 5% ethanolic sodium hydroxide solution having a temperature of about 10 to 16° C.; (c) thereafter contacting said film with a photographic developer solution having a temperature of about 50° C.; and (d) further processing said film to fix, rinse and dry the photographic half-tone image obtained upon development.
Claim 3
Dependent Claim
13 words
The method according to claim 1 wherein said photographic developer solution contains hydroquinone.
Claim 4
Dependent Claim
23 words
The method according to claim 2 wherein said film is immersed horizontally in said 5% ethanolic sodium hydroxide solution for about 25 seconds.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein residual moisture profile is that of the steady-state boundary layer flow of a gas in aerodynamic equipment.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said contacting of said film with a photographic developer comprises passing said film through a rolling device charged with said developer solution.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said film of step (b) is treated to remove surface moisture therefrom before the contacting of step (c).
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |