US4350757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making visible residual moisture distributions in photographic wet film layers subjected to an oncoming flow
Assignee: Siemens AG
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Filing: 1981-02-18
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Granted: 1982-09-21
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Expires: 2001-02-18
Abstract
Abstract The invention relates to a method for making visible by photochemical means residual moisture distributions in photographic wet film layers subjected to a gas flow. According to the invention, a film diffusely pre-exposed is immersed in an aqueous swelling agent solution which contains either (a) a reducing agent or (b) an alkali. After being exposed to the air stream, the invisible residual moisture profile is immersed in an alcoholic solution of either (a) an alkali or (b) a reducing agent. The half-tone image produced serves for determining stationary local boundary layer thickness distributions, wall shearing stresses, material transfer coefficients and heat transfer coefficients.
Inventors
- 👤 Bernhard Montag
- 👤 Gert Mages
- 👤 Heinrich Opitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:32
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
A method for making visible by photochemical means residual moisture distributions in photographic wet film layers exposed to flow, comprising: (a) providing a silver halide-containing photographic film diffusively pre-exposed in daylight; (b) placing said film in an aqueous swelling agent solution until the gelatin layer of said film is saturated, said swelling agent solution containing a member selected from (1) a reducing agent and (2) an alkali material; (c) applying said swelled film to a surface; (d) exposing said surface having said swelled film thereon to a flow to obtain invisible residual moisture distributions in said film; (e) immersing said film in a solution selected from (1) a substantially water-free alcoholic alkali solution where the swelling agent solution of step (b) contains a reducing agent, and (2) a substantially water-free alcoholic solution of a reducing agent where the swelling agent solution of step (b) contains an alkali material, so as to make visible said moisture distributions.
Claim 2
Independent Claim
156 words
A method for making visible by photochemical means residual moisture distributions in photographic wet film layers exposed to flow, comprising: (a) providing a silver halide-containing photographic film diffusively pre-exposed in daylight; (b) placing said film in an aqueous swelling agent solution until the gelatin layer of said film is saturated, said swelling agent solution containing a member selected from (1) a reducing agent and (2) an alkali material; (c) applying said swelled film to a surface; (d) exposing said surface having said swelled film thereon to a flow to obtain invisible residual moisture distributions in said film; (e) immersing said film in a solution selected from (1) a substantially water-free alcoholic alkali solution where the swelling agent solution of step (b) contains a reducing agent, and (2) a substantially water-free alcoholic solution of a reducing agent where the swelling agent solution of step (b) contains an alkali material, so as to make visible said moisture distributions.
Claim 3
Dependent Claim
48 words
The method according to claim 1 wherein said swelling agent solution comprises a water/glycol mixture having a glycol content of from about 10 to 50 percent by volume and which contains from about 1 to 10 percent by weight of a reducing agent, referred to the water content.
Claim 4
Dependent Claim
46 words
The method according to claim 1 wherein said swelling agent solution comprises a water/glycol mixture having a glycol content of from about 10 to 50 percent by volume and which contains from about 1 to 10 percent by weight water-soluble alkali, referred to the water content.
Claim 5
Independent Claim
27 words
The method according to claims 1, 2 or 3 wherein said film diffusely pre-exposed in daylight is immersed for about 5 minutes in the swelling agent solution.
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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |