US4253749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic theater projector
Assignee: Individual
•
Filing: 1979-09-24
•
Granted: 1981-03-03
•
Expires: 1999-09-24
Abstract
Abstract An improved electronic film transport is disclosed for advancing motion picture film past a light gate in a motion picture projector. The light gate includes a transparent plate which imparts a desired shape to the film and, preferrably, one or more indexing pins which align the film with the plate. A sprocket is driven to advance the film to the light gate, causing a loop to form in the film and the film to move clear of the plate and indexing pins. A second sprocket then is driven to advance the film from the light gate. When the film advances one frame, it is again in contact with the plate and the indexing pin and the newly indexed frame is projected.
Inventors
- 👤 Angelo Boudouris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:20
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G03B1/00; G03B1/18; G03B1/20; G03B1/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A film transport for motion picture projector comprising a light gate including surface means for imparting a predetermined curvature to at least one picture frame on the film, film supply means for continuously delivering film at a predetermined speed, first controlled sprocket means for advancing such delivered film to said light gate, film take-up means for continuously receiving film, second controlled sprocket means for advancing film from said light gate to said take-up means, first means for controlling said first sprocket means to advance said film to said light gate, said advancing film moving clear of said surface means, and second means for controlling said second sprocket means to advance said film away from said light gate after said film is advanced by said first sprocket means at least clear of said surface means.
Claim 2
Dependent Claim
134 words
A film transport for motion picture projector comprising a light gate including surface means for imparting a predetermined curvature to at least one picture frame on the film, film supply means for continuously delivering film at a predetermined speed, first controlled sprocket means for advancing such delivered film to said light gate, film take-up means for continuously receiving film, second controlled sprocket means for advancing film from said light gate to said take-up means, first means for controlling said first sprocket means to advance said film to said light gate, said advancing film moving clear of said surface means, and second means for controlling said second sprocket means to advance said film away from said light gate after said film is advanced by said first sprocket means at least clear of said surface means.
Claim 3
Dependent Claim
65 words
A film transport for a motion picture projector, as set forth in claim 1, wherein said means for controlling said first sprocket means causes said first sprocket means to advance one picture frame to said light gate, and wherein said means for controlling said second sprocket means causes said second sprocket means to advance said film by one picture frame away from said light gate.
Claim 4
Dependent Claim
49 words
A film transport for a motion picture projector, as set forth in claims 1 or 2, and wherein said light gate further includes indexing means for aligning the film with said surface means, and wherein such advancing film moves clear of both said surface means and said indexing means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |