US3720150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazo film developer
Assignee: Memorex Corp
•
Filing: 1971-02-16
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Granted: 1973-03-13
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Expires: 1991-02-16
Abstract
Abstract A diazo film developer and method of developing roll-type diazo film, continuously fed into the developer through a seal, wherein the film is (1) subjected to a cycled air mixture containing water vapor cooled to the dew point whereby a water condensate is deposited on the surface of the film, (2) simultaneously subjected to an ammonia vapor which is absorbed by the water condensate to develop the film, (3) subsequently subjected to the cycled air mixture preheated to dry the film and scavenge excess ammonia gas.
Inventors
- 👤 R Hurtig
- 👤 D Geri
- 👤 P Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
G; G03; G03D; G03D7/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
23 words
A film developer for diazo film comprising: a. means defining a film processing zone having a film entrance and a film exit with
Claim 2
Dependent Claim
23 words
A film developer for diazo film comprising: a. means defining a film processing zone having a film entrance and a film exit with
Claim 3
Dependent Claim
4 words
a developing area, and
Claim 4
Dependent Claim
4 words
a developing area, and
Claim 5
Dependent Claim
105 words
a drying area, b. transport means for moving film through said zone from said entrance through said developing area hence through said drying area and then through said exit, c. air circulation means for moving air in counterflow relation to said film into said drying area and hence through said developing area, d. temperature control means for heating air to maintain the air in said drying area hotter than the air in said developing area, and e. supply means for supplying water and ammonia to air circulated by said circulating means to provide an air-water-ammonia mixture near the dew point thereof in said developing area.
Claim 6
Dependent Claim
105 words
a drying area, b. transport means for moving film through said zone from said entrance through said developing area hence through said drying area and then through said exit, c. air circulation means for moving air in counterflow relation to said film into said drying area and hence through said developing area, d. temperature control means for heating air to maintain the air in said drying area hotter than the air in said developing area, and e. supply means for supplying water and ammonia to air circulated by said circulating means to provide an air-water-ammonia mixture near the dew point thereof in said developing area.
Claim 7
Dependent Claim
34 words
The developer of claim 1 in which said tempeRature control means comprises means for heating air entering said drying area and means for cooling air passing from said drying area to said developing area.
Claim 8
Dependent Claim
34 words
The developer of claim 2 in which said air circulation means comprises a pump connected between said developing area and said drying area for pumping air from said developing area to said drying area.
Claim 9
Dependent Claim
25 words
The developer of claim 3 in which said pump is connected to said supply means for introducing water into said developer outside said processing zone.
Claim 10
Dependent Claim
44 words
The apparatus of claim 4 in which said means for heating air is connected between said pump and said drying area to heat circulating air above its dew point after said air contacts said supply means and before said air enters said drying area.
Claim 11
Dependent Claim
30 words
The developer of claim 4 in which said means for cooling air comprises a wall portion of said developer and guide means for guiding circulating air against said wall portion.
Claim 12
Dependent Claim
77 words
The developer of claim 1 in which said film exit comprises: a. a housing having a wall with a passageway therethrough connected to said drying chamber, b. a first recess in the wall of said passageway, c. a second recess in the wall of said passageway between said first recess and said drying chamber, d. ammonia absorbing means, e. means for pumping air from said first recess, through said ammonia absorbing means and into said second recess.
Claim 13
Dependent Claim
86 words
A film exit for transporting diazo film from the drying chamber of a developing machine comprising: a. a housing having a wall with a passageway therethrough extending out of said developer from said drying chamber, b. a first recess in the wall of said passageway, c. a second recess in the wall of said passageway between said first recess and said drying chamber, d. ammonia absorbing means, e. means for pumping air from said first recess, through said ammonia absorbing means and into said second recess.
Claim 14
Dependent Claim
86 words
A film exit for transporting diazo film from the drying chamber of a developing machine comprising: a. a housing having a wall with a passageway therethrough extending out of said developer from said drying chamber, b. a first recess in the wall of said passageway, c. a second recess in the wall of said passageway between said first recess and said drying chamber, d. ammonia absorbing means, e. means for pumping air from said first recess, through said ammonia absorbing means and into said second recess.
Claim 15
Dependent Claim
66 words
A film seal for transporting film from a processing unit comprising: a. a passageway into the processing unit having a passageway wall b. a first recess in the wall of said passageway c. a second inner recess in the wall of said passageway d. air scrubbing means e. means for pumping air from said first recess through said air scrubbing means and into said second recess.
Claim 16
Dependent Claim
66 words
A film seal for transporting film from a processing unit comprising: a. a passageway into the processing unit having a passageway wall b. a first recess in the wall of said passageway c. a second inner recess in the wall of said passageway d. air scrubbing means e. means for pumping air from said first recess through said air scrubbing means and into said second recess.
Claim 17
Dependent Claim
24 words
The film seal of claim 9 further comprising guide means to transport the film through the passageway without contacting the walls of the passageway.
Claim 18
Independent Claim
113 words
The method of developing diazo film which comprises: a. continuously moving said film along a path in a predetermined direction, b. circulating air along a closed path from a first area out of the film path to a second area contacting the film path to a third area contacting the film path upstream of the film path from the second area and hence back to said first area, c. maintaining a mixture of water and ammonia in said circulating air in said third area adjacent to the dew point thereof, d. heating said circulating air between said first and second areas, and e. cooling said circulating air between said second and third areas.
Claim 19
Independent Claim
113 words
The method of developing diazo film which comprises: a. continuously moving said film along a path in a predetermined direction, b. circulating air along a closed path from a first area out of the film path to a second area contacting the film path to a third area contacting the film path upstream of the film path from the second area and hence back to said first area, c. maintaining a mixture of water and ammonia in said circulating air in said third area adjacent to the dew point thereof, d. heating said circulating air between said first and second areas, and e. cooling said circulating air between said second and third areas.
References Cited (Backward Citations)
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |