US3673985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development apparatus for electrophotographic copies
Assignee: Van der Grinten NV
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Filing: 1970-06-18
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Granted: 1972-07-04
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Expires: 1990-06-18
Abstract
Abstract An apparatus for liquid developing of electrophotographic copies has a passage for the copies through the liquid in the reservoir, said passage being bordered on one side by a hollow rotating cylinder having internal blades for pumping the liquid through openings in the cylinder into said passage.
Inventors
- 👤 Wilhelmus Emilius Maria Dols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
An apparatus for liquid developing of electrophotographic copies, provided with a liquid reservoir, a passageway through said reservoir for submerging and passing copies to be developed therethrough, a developing electrode positioned in said reservoir below the level of the liquid and being curved and provided with openings, the convex side of said electrode bordering the said passageway at one side thereoF, said apparatus being provided with liquid displacing means which press the developing liquid from the concave side of the developing electrode through the said openings, characterized in that said developing electrode is the peripheral wall of a hollow rotating cylinder and said liquid displacing means include blades disposed inside and at an angle to the concave side of said wall.
Claim 2
Independent Claim
121 words
An apparatus for liquid developing of electrophotographic copies, provided with a liquid reservoir, a passageway through said reservoir for submerging and passing copies to be developed therethrough, a developing electrode positioned in said reservoir below the level of the liquid and being curved and provided with openings, the convex side of said electrode bordering the said passageway at one side thereoF, said apparatus being provided with liquid displacing means which press the developing liquid from the concave side of the developing electrode through the said openings, characterized in that said developing electrode is the peripheral wall of a hollow rotating cylinder and said liquid displacing means include blades disposed inside and at an angle to the concave side of said wall.
Claim 3
Dependent Claim
36 words
An apparatus according to claim 1, said wall being formed by arcuate outer end portions of said blades and said openings being slots provided between free terminal edges of said end portions and the adjacent blades.
Claim 4
Dependent Claim
82 words
An apparatus according to claim 2, said cylinder being built up of extruded profile sections in a number equal to the number of said blades and slots, each profile section being substantially U-shaped and comprising a central part forming a blade, an inner leg forming a shaft part and an outer leg forming part of said peripheral wall, there being a slot between a free edge of each leg of each profile section and the central part of an adjacent profile section.
Claim 5
Dependent Claim
76 words
An apparatus according to claim 1, said electrode cylinder having closures on its ends and having a hollow shaft passing through at least one of said closures, said blades being connected to said shaft, and said shaft being provided with openings therethrough in regions thereof between said blades, at least one end of said shaft protruding outside the electrode cylinder and opening into the liquid containing space of said reservoir for communication with the liquid therein.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |