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US4346166A
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US
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Method of making families of steady-state heat transfer coefficient curves visible by photochemical means
Assignee: Siemens AG
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Filing: 1981-02-20
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Granted: 1982-08-24
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Expires: 2001-02-20
Abstract
Abstract For making families of steady-state heat transfer coefficient curves visible, the invisible residual moisture profile obtained by exposing a moisture photogelatin layer to a gas is immersed, in daylight, in a soluble organic sulfur compound, particularly thioacetamide, and is converted into a silver sulfide line photogram. The method is used, for example, for making visible families of steady-state heat transfer coefficient curves on forced air-cooled electronic assemblies.
Inventors
- 👤 Bernhard Montag
- 👤 Heinrich Optiz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:40
CPC Classifications
G; G01; G01P; G01P13/00; G01P13/0093
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
In a method for making families of steady-state heat transfer coefficient curves visible by photochemical means, wherein, a moist silver halide-containing photogelatin layer is applied to a surface and subjected to a gas stream, whereby an invisible residual moisture profile is obtained in said photogelatin layer, the improvement comprising converting said residual moisture profile into a silver sulfide line photogram by immersing said photogelatin layer, in daylight, in a developer solution mixture comprising alcohol and an organic sulfur compound soluble in alcohol and capable of reacting with the silver halide to form a silver sulfide, and thereafter fixing the line photogram.
Claim 2
Dependent Claim
101 words
In a method for making families of steady-state heat transfer coefficient curves visible by photochemical means, wherein, a moist silver halide-containing photogelatin layer is applied to a surface and subjected to a gas stream, whereby an invisible residual moisture profile is obtained in said photogelatin layer, the improvement comprising converting said residual moisture profile into a silver sulfide line photogram by immersing said photogelatin layer, in daylight, in a developer solution mixture comprising alcohol and an organic sulfur compound soluble in alcohol and capable of reacting with the silver halide to form a silver sulfide, and thereafter fixing the line photogram.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein said developer solution mixture comprises from about 0.5 to 2 grams of said sulfur compound, referred to 100 ml of solvent mixture.
Claim 4
Independent Claim
14 words
The method according to claims 1 or 2 wherein said sulfur compound is thioacetamide.
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) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |