US3915708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing diazo prints from an external supply source of ammonia and carbon dioxide
Assignee: Individual
•
Filing: 1974-02-21
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Granted: 1975-10-28
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Expires: 1994-02-21
Abstract
Abstract In accordance with the invention diazo-dye coated sheets are developed in the presence of water vapor in the development chamber of apparatus for making diazo dye type reproductions by conducting into the chamber a flow of ammonia in vapor form sufficient to fully develop said diazo-dye coated sheets and a flow of carbon dioxide in vapor form sufficient to substantially reduce the ammonia odor.
Inventors
- 👤 Norman A Zausmer
- 👤 Arnold S Michlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:02
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/18; G03D; G03D7/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
IN A METHOD FOR DEVELOPING TWO-COMPONENT TYPE DIAZODYE COATED SHEETS POSITIONED IN A DEVELOPMENT CHAMBER BY CONTACTING THE SHEETS WITH AMMONIA VAPOR IN THE PRESENCE OF WATER VAPOR, THE IMPROVEMENT WHICH COMPRISES CONDUCTING INTO SAID CHAMBER, THROUGH A CONDUIT, A FLOW OF A MIXTURE OF AMMONIA VAPORS, CARBON DIOXIDE VAPOR AND WATER VAPOR, SAID MIXTURE OF VAPORS BEING WITHDRAW FROM AN AQUEOUS SOLUTION OF AMMONIA AND CARBON DIOXIDE IN A CONTAINER LOCATED EXTERIORLY OF SAID CHAMBER AND CONNECTED TO SAID CHAMBER BY SAID CONDUIT BY PASSING GASES EXHAUSTED FROM THE CHAMBER THROUGH THE SOLUTION, THE CONCENTRATION OF THE CARBON DIOXIDE AND THE AMMONIA IN SAID SOLUTION BEING SUCH THAT TECARBON DIOXIDETO-AMMONIA RATIO, IN TERMS OF PARTS BY WEIGHT THEREOF IN SAID SOLUTION, IS FROM ABOUT 1:1 TO 1:20 AND HE CONCENRATION OF THE AMMONIA IS AT LEAST ABOUT 1 POUND PER GALLON OF SOLUTION.
Claim 2
Dependent Claim
144 words
IN A METHOD FOR DEVELOPING TWO-COMPONENT TYPE DIAZODYE COATED SHEETS POSITIONED IN A DEVELOPMENT CHAMBER BY CONTACTING THE SHEETS WITH AMMONIA VAPOR IN THE PRESENCE OF WATER VAPOR, THE IMPROVEMENT WHICH COMPRISES CONDUCTING INTO SAID CHAMBER, THROUGH A CONDUIT, A FLOW OF A MIXTURE OF AMMONIA VAPORS, CARBON DIOXIDE VAPOR AND WATER VAPOR, SAID MIXTURE OF VAPORS BEING WITHDRAW FROM AN AQUEOUS SOLUTION OF AMMONIA AND CARBON DIOXIDE IN A CONTAINER LOCATED EXTERIORLY OF SAID CHAMBER AND CONNECTED TO SAID CHAMBER BY SAID CONDUIT BY PASSING GASES EXHAUSTED FROM THE CHAMBER THROUGH THE SOLUTION, THE CONCENTRATION OF THE CARBON DIOXIDE AND THE AMMONIA IN SAID SOLUTION BEING SUCH THAT TECARBON DIOXIDETO-AMMONIA RATIO, IN TERMS OF PARTS BY WEIGHT THEREOF IN SAID SOLUTION, IS FROM ABOUT 1:1 TO 1:20 AND HE CONCENRATION OF THE AMMONIA IS AT LEAST ABOUT 1 POUND PER GALLON OF SOLUTION.
Claim 3
Dependent Claim
20 words
A method as set forth in claim 1, wherein said solution is maintained at a temperature of aT least 80*F.
Claim 4
Dependent Claim
36 words
A method as set forth in claim 1, wherein at least about one part by volume carbon dioxide vapor is conducted into the chamber for every 10 parts by volume ammonia vapor conducted into the chamber.
Claim 5
Dependent Claim
39 words
A method as set forth in claim 1, wherein said solution is prepared by passing ammonia vapor and carbon dioxide vapor into water, either sequentially or simultaneously, to cause said ammonia and carbon dioxide to dissolve in the water.
References Cited (Backward Citations)
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US2671728A
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US2923625A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |