US3682080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for developing photographic films
Assignee: Individual
•
Filing: 1970-11-06
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Granted: 1972-08-08
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Expires: 1990-11-06
Abstract
Abstract One or more developing drums having spaced opposite ends are mounted for rotation in a housing and a supply supplies liquid developer to the interior of these drums. Raising arrangement utilizing eccentric cams or the like is provided for alternately raising or lowering one end of each drum at predetermined time intervals and through a predetermined distance to thereby cause longitudinally traveling waves of the developer in the drums.
Inventors
- 👤 Werner Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:48
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/02; G03D13/04; G03D13/046
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
In an apparatus for developing photographic films, in combination at least one developing drum having spaced opposed ends and being adapted to contain therein photographic films and developing fluid; mounting means mounting said drum for rotation about a substantially horizontal axis; drive means for rotating said drum; and raising means cooperating with said drive means for affecting sequential raising and lowering one of said ends of said drum during rotation of the latter for creating therein longitudinally traveling waves of developing fluid in a substantially axial direction of said drum to improve development of photographic films contained therein.
Claim 2
Dependent Claim
98 words
In an apparatus for developing photographic films, in combination at least one developing drum having spaced opposed ends and being adapted to contain therein photographic films and developing fluid; mounting means mounting said drum for rotation about a substantially horizontal axis; drive means for rotating said drum; and raising means cooperating with said drive means for affecting sequential raising and lowering one of said ends of said drum during rotation of the latter for creating therein longitudinally traveling waves of developing fluid in a substantially axial direction of said drum to improve development of photographic films contained therein.
Claim 3
Dependent Claim
24 words
In an apparatus as defined in claim 1, wherein said raising means comprises excenter drive means beneath and operative for raising said one end.
Claim 4
Dependent Claim
15 words
In an apparatus as defined in claim 1, said raising means comprising eccentric cam means.
Claim 5
Dependent Claim
26 words
In an apparatus as defined in claim 1, said drive means comprising drive rollers supporting said drum and operative for rotating the same about said axis.
Claim 6
Dependent Claim
40 words
In an apparatus as defined in claim 1; and further comprising mounting means mounting said drum in the region of the other of said ends for pivotal displacement about an other substantially horizontal axis extending transversely to the first-mentioned axis.
Claim 7
Dependent Claim
23 words
In an apparatus as defined in claim 5; further comprising a support; and wherein said mounting means mounts said drum on said support.
Claim 8
Dependent Claim
79 words
In an apparatus as defined in claim 1, said drum having a main portion, and a terminal portion tapering conically away from said main portion and towards said one end, said terminal portion having an outlet opening for developing fluid in the region of said one end; and further comprising an annular member accommodated in said drum at the juncture of said portions and being provided with circumferentially spaced recesses for facilitating movement of developing fluid between said portions.
Claim 9
Dependent Claim
61 words
In an apparatus as defined in claim 7, said drum accommodating a predetermined quantity of developing fluid and said annular member having a central aperture whose diameter is so selected with reference to said quantity and said distance that waves of developing fluid resulting from said raising and travelling longitudinally of said drum, are prevented from passing through said central aperture.
Claim 10
Dependent Claim
35 words
In an apparatus as defined in claim 1, said drum being open at said one end; and further comprising a cap of resilient material overlying and substantially closing said other end in removable relationship therewith.
Claim 11
Dependent Claim
27 words
In apparatus as defined in claim 1, said drive means comprising drive rollers supporting and rotating said drum, and motor means for intermittently rotating said drive rollers.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |