US3882568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movie film cleaning system
Assignee: Individual
•
Filing: 1973-08-20
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Granted: 1975-05-13
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Expires: 1993-08-20
Abstract
Abstract A device is provided for cleaning movie film and the like of particles adhering thereto as by electrostatic attraction. The particles are dislodged by action of opposed rotary brushes and transverse and longitudinal air streams drawn by suction into a vacuum plenum divided by the film and in which the brushes are located.
Inventors
- 👤 George P Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:06
CPC Classifications
B; B08; B08B; B08B1/00; B08B1/20; A; A47; A47L; A47L7/00; A47L7/0047; B08B5/00; B08B5/04; B08B5/043; B08B5/046
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A cleaning device for movie film and the like comprising: a housing assembly providing a vacuum plenum, guide means for guiding the film endwise through the plenum such that the film divides the plenum into two vacuum chambers, said guide means comprising a front pair of guide grooves separated from one another by a front air intake and a rear pair of guide grooves aligned with the front pair and separated from one another by a rear air intake, said front pair being separated from said rear pair by a pair of side air intakes, said front, rear and side air intakes having a restricted height arranged to be divided by said film such that each of said chambers is served by respective front rear and side restriction air intakes, a pair of opposed rotary brush means journal-mounted in said chambers and arranged and adapted to dislodge foreign particles from both faces of the film across the full width thereof, and suction means connected to said chambers for drawing air into said chambers through all of said air intakes simultaneously whereby air circulates over the side edges and entire surface of the film in the vicinity of the brush means.
Claim 2
Dependent Claim
200 words
A cleaning device for movie film and the like comprising: a housing assembly providing a vacuum plenum, guide means for guiding the film endwise through the plenum such that the film divides the plenum into two vacuum chambers, said guide means comprising a front pair of guide grooves separated from one another by a front air intake and a rear pair of guide grooves aligned with the front pair and separated from one another by a rear air intake, said front pair being separated from said rear pair by a pair of side air intakes, said front, rear and side air intakes having a restricted height arranged to be divided by said film such that each of said chambers is served by respective front rear and side restriction air intakes, a pair of opposed rotary brush means journal-mounted in said chambers and arranged and adapted to dislodge foreign particles from both faces of the film across the full width thereof, and suction means connected to said chambers for drawing air into said chambers through all of said air intakes simultaneously whereby air circulates over the side edges and entire surface of the film in the vicinity of the brush means.
Claim 3
Dependent Claim
79 words
Apparatus according to claim 1 in which said housing assembly is separable at the level of said guide grooves into two housings adapted to be moved relative to one another for insertion of a film, each of said housings having one of said brush means journal-mounted therein and a respective drive component arranged to interact with the drive component of the other said housing, said drive components being arranged to separate from one another when the housings are separated.
Claim 4
Dependent Claim
190 words
A cleaning device for movie film and the like, comprising: a housing assembly, guide means in the housing assembly for guiding the side edge portions of a film along a given linear travel path, said path having an intermediate cleaning zone within the housing assembly in which said side edge portions are exposed, a pair of opposed rotaRy brushes in said zone extending transversely for the full width of said path and arranged to brush the opposite faces of a film moving longitudinally along said path and dislodge foreign particles on said faces, a pair of air intake jets spaced apart by said brushes along the length of said film and directing air streams along said film at points where said brushes act on said film, a pair of air intake ports spaced apart by said brushes by the width of said film and directing air streams along said film at points where said brushes act on said film, and suction means acting in said zone for drawing air through said intake jets and said intake ports and for conveying away the particles dislodged from the film by said brushes.
Claim 5
Dependent Claim
190 words
A cleaning device for movie film and the like, comprising: a housing assembly, guide means in the housing assembly for guiding the side edge portions of a film along a given linear travel path, said path having an intermediate cleaning zone within the housing assembly in which said side edge portions are exposed, a pair of opposed rotaRy brushes in said zone extending transversely for the full width of said path and arranged to brush the opposite faces of a film moving longitudinally along said path and dislodge foreign particles on said faces, a pair of air intake jets spaced apart by said brushes along the length of said film and directing air streams along said film at points where said brushes act on said film, a pair of air intake ports spaced apart by said brushes by the width of said film and directing air streams along said film at points where said brushes act on said film, and suction means acting in said zone for drawing air through said intake jets and said intake ports and for conveying away the particles dislodged from the film by said brushes.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 3 in which each of said air streams is bisected by said film, thereby causing air to flow on each surface of said film.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |