US4317026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing chamber
Assignee: Hoechst AG
•
Filing: 1980-03-25
•
Granted: 1982-02-23
•
Expires: 2000-03-25
Abstract
Abstract This invention relates to an improvement in a developing chamber for developing a photographic recording material for use in the vesicular method, comprising a housing and pairs of feed and discharge rolls therein, the improvement comprising at least two heatable metal blocks within said housing at an adjustable distance with respect to each other, whereby a gap for passage of recording material is provided, sliding enhancing material means on areas of the blocks facing the gap, the sliding enhancing material means being inert to the recording material, and temperature control means ensuring low temperature variations in the blocks.
Inventors
- 👤 Jochen Koblo
- 👤 Gotz von dem Bussche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:22
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
In a developing chamber for developing a photographic recording material for use in the vesicular method, comprising a housing and pairs of feed and discharge rolls therein, the improvement comprising at least two heatable metal blocks within said housing at an adjustable distance with respect to each other whereby a gap for a rectilinear passage of recording material is provided, the distance between said blocks facing the gap and a surface of the recording material in said gap being in the range of about 25 to 50 μm, sliding enhancing material means in areas of said blocks facing said gap, said sliding enhancing material means being inert to said recording material, and temperature control means ensuring low temperature variations in said blocks and a temperature variation in said gap less than about ±1.5° C.
Claim 2
Dependent Claim
134 words
In a developing chamber for developing a photographic recording material for use in the vesicular method, comprising a housing and pairs of feed and discharge rolls therein, the improvement comprising at least two heatable metal blocks within said housing at an adjustable distance with respect to each other whereby a gap for a rectilinear passage of recording material is provided, the distance between said blocks facing the gap and a surface of the recording material in said gap being in the range of about 25 to 50 μm, sliding enhancing material means in areas of said blocks facing said gap, said sliding enhancing material means being inert to said recording material, and temperature control means ensuring low temperature variations in said blocks and a temperature variation in said gap less than about ±1.5° C.
Claim 3
Dependent Claim
26 words
A developing chamber according to claim 1 in which said metal blocks are heatable to a temperature within the range of about 100° to 250° C.
Claim 4
Dependent Claim
28 words
A developing chamber according to claims 1 and 2 in which the metal blocks are heatable to a temperature within the range of about 100° to 140° C.
Claim 5
Dependent Claim
16 words
A developing chamber according to claim 1 in which said sliding enhancing material is a fabric.
Claim 6
Dependent Claim
19 words
A developing chamber according to claim 4 in which the fabirc (in which the fabric) is a polyamide fabric,
Claim 7
Dependent Claim
16 words
A developing chamber according to claim 1 including means for cooling said feed and discharge rolls.
References Cited (Backward Citations)
US3313913A
Cited
US3230089A
Cited
US3311040A
Cited
US3449547A
Cited
US3629549A
Cited
US3757662A
Cited
US3902041A
Cited
US3864709A
Cited
US4052732A
Cited
US4116559A
Cited
US4147422A
Cited
US4194826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |