US3615424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color oscillograph recording paper
Assignee: GAF Corp
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Filing: 1966-04-25
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Granted: 1971-10-26
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Expires: 1986-04-25
Abstract
Abstract Light-sensitive multicolor recording paper for oscillograph traces, having on a support, an undercoat of green-sensitive gelatin-silver bromoiodide emulsion in which the iodine amounts to 0.2-2.0 mol percent of the silver and containing a magenta color former, a gelatin interlayer, an overlying blue-sensitive gelatin-silver bromoiodide emulsion in which the iodine is 4-12 mol percent of the silver content and containing cyan color former, and a gelatin surface coating. By using yellow and magenta filters of different density for the exposing light and subjecting the material to color development, at least three different color traces can be produced.
Inventors
- 👤 Carl E Johnson
- 👤 Dewey M Dumers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:06
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3029
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
The paper of claim 1 in which the silver halide emulsion layers are coated to a silver coating weight of about 0.4 grams silver per square meter.
Claim 2
Dependent Claim
43 words
The paper of claim 1 in which the outercoat silver halide emulsion layer has a light sensitivity in the wavelength region from 480 to 500 microns region which is at least six times higher than that of the undercoat silver halide emulsion layer.
Claim 3
Dependent Claim
14 words
The paper of claim 1 in which the magenta color former has the formula:
Claim 4
Dependent Claim
14 words
The paper of claim 1 in which the cyan color former has the formula:
Claim 5
Dependent Claim
217 words
A process of forming a multicolored image which comprises exposing with a plurality of selectively filtered colored lights, a multicolor recording paper for recording oscillograph traces in at least three colors which comprises, (a) a flexible support bearing on at least one surface thereof in the following order: (b) a hardened silver bromoiodide emulsion, having a low sensitivity to light havIng a wavelength of 480 microns and above, and being optically sensitized to the green and containing a color former capable of forming a magenta dye image upon color development, said emulsion having an iodide content ranging from 0.2 to 2.0 mole percent based on the amount of silver present in the emulsion, (c) a hardened gelatin intersurface layer, (d) a hardened silver bromoiodide emulsion coating which is blue sensitive in the wavelength region ranging from 400 to 510 microns and containing a color former capable of forming a cyan dye image upon color development, the iodide content of said outer coated emulsion layer ranging from 4.0 to 12.0 mole percent based on the silver present, and (e) as an outer surface layer, a hardened gelatin layer, developing the imagewise exposed recording material with a color developer solution comprising an aromatic diamine developing agent and fixing the color developed material without bleaching and washing the processed material.
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 |