US3589262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processing apparatus
Assignee: Polaroid Corp
•
Filing: 1968-06-21
•
Granted: 1971-06-29
•
Expires: 1988-06-21
Abstract
Abstract An apparatus in which a viscous photographic, processing liquid is distributed in a thin layer between an exposed photosensitive element and another element by moving the elements in superposition through a convergent passage between a pair of juxtaposed pressure-applying members. The viscosity of the liquid varies inversely with temperature. The speed of movement of the elements is constant while the pressure-applying members are biased toward one another with a force that is varied in inverse relation to the ambient temperature to insure uniform liquid distribution despite temperature changes.
Inventors
- 👤 Richard J Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:49
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
Photographic processing apparatus for treating an exposed photosensitive element by distributing a liquid processing agent having a viscosity which varies with temperature, as a thin layer in contact with said photosensitive element, said apparatus comprising, in combination: a pair of pressure-applying members providing a passage between said members through which a photosensitive element and a second element are movable in superposition to distribute a viscous processing agent in a thin layer between said elements; advancement means for moving said elements at substantially constant speed in superposition through said passage between said members; and temperature-responsive biasing means for urging said pressureapplying members toward one another with a force that is an inverse function of the ambient temperature.
Claim 2
Dependent Claim
116 words
Photographic processing apparatus for treating an exposed photosensitive element by distributing a liquid processing agent having a viscosity which varies with temperature, as a thin layer in contact with said photosensitive element, said apparatus comprising, in combination: a pair of pressure-applying members providing a passage between said members through which a photosensitive element and a second element are movable in superposition to distribute a viscous processing agent in a thin layer between said elements; advancement means for moving said elements at substantially constant speed in superposition through said passage between said members; and temperature-responsive biasing means for urging said pressureapplying members toward one another with a force that is an inverse function of the ambient temperature.
Claim 3
Dependent Claim
27 words
Photographic processing apparatus as defined in claim 1 wherein said biasing means include spring means and temperature-responsive means for varying the effective length of said spring means.
Claim 4
Dependent Claim
82 words
Photographic processing apparatus as defined in claim 2 wherein said temperature-responsive means for varying the effective length of said spring means include an element mounted at one section on a portion of said apparatus in fixed position relative to said spring means, and including another section engaged with said spring means and at least an intermediate section formed of a material having a thermal coefficient of expansion substantially different from said spring means and portions of said apparatus mounting said spring means.
Claim 5
Dependent Claim
18 words
Photographic apparatus as defined in claim 3 wherein said element has a relatively high thermal coefficient of expansion.
Claim 6
Dependent Claim
26 words
Photographic processing apparatus as defined in claim 1 wherein said biasing means include spring means and temperature-responsive means for varying the deflection of said spring means.
Claim 7
Dependent Claim
82 words
Photographic processing apparatus as defined in claim 5 wherein said temperature-responsive means for varying the deflection of said spring means include an element mounted at one section on a portion of said apparatus in fixed position with respect to said spring means, and including another section engaged with said spring means and at least an intermediate section formed of a material having a thermal coefficient of expansion substantially different from said spring means and portions of said apparatus mounting said spring means.
Claim 8
Dependent Claim
19 words
Photographic processing apparatus as defined in claim 6 wherein said element has a relatively high thermal coefficient of expansion.
Claim 9
Dependent Claim
30 words
Photographic processing apparatus as defined in claim 1 wherein said biasing means include spring means formed of a bimetallic material which changes its configuration in response to changes in temperature.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |