Patent US3799420A successfully refreshed from Google Patents.
US3799420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filmstrip projector with synchronized sound
Assignee: Bell and Howell Co
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Filing: 1972-01-13
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Granted: 1974-03-26
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Expires: 1992-01-13
Abstract
Abstract A filmstrip projector provided with synchronized audio accompaniment. The filmstrip is framed with respect to a projection aperture by a manually operable framing means. Once framed, the filmstrip is advanced frame-by-frame by a motor driven film advance mechanism. The audio accompaniment is carried on a dual track audio tape one track of which carries the audio accompaniment. The remaining track carries control signals which serve to actuate the film advance mechanism to maintain synchronization between the audio track and the filmstrip.
Inventors
- 👤 F Badalich
- 👤 R Watterlohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:30
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06; G03B31/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A cartridge comprising: a housing means; means within said housing means for receiving a roll of film; means located within said housing means for driving said film, said drive means including sprocket means for drivingly engaging the sprocket holes of said film; and retaining means located on said housing means for releasably receiving a conventional reel to reel tape cassette having a driven reel and a take-up reel wherein said tape cassette is retained in a preselected position with respect to said housing and wherein said tape cassette may be selectively removed from said retaining means.
Claim 2
Dependent Claim
96 words
A cartridge comprising: a housing means; means within said housing means for receiving a roll of film; means located within said housing means for driving said film, said drive means including sprocket means for drivingly engaging the sprocket holes of said film; and retaining means located on said housing means for releasably receiving a conventional reel to reel tape cassette having a driven reel and a take-up reel wherein said tape cassette is retained in a preselected position with respect to said housing and wherein said tape cassette may be selectively removed from said retaining means.
Claim 3
Dependent Claim
21 words
The cartridge of claim 1 wherein said housing means includes a base member defining a portion of said cassette retaining means.
Claim 4
Dependent Claim
20 words
The cartridge of claim 2 wherein said retaining means retains said cassette in a position adjacent to said base member.
Claim 5
Dependent Claim
38 words
The cartridge of claim 3 wherein said housing means further includes a pair of retaining walls which define a portion of said cassette retaining means and which retain said cassette in said position adjacent to said base member.
Claim 6
Dependent Claim
22 words
The cartridge of claim 1 wherein said retaining means further comprises a spring means for retaining said cassette in said preselected position.
Claim 7
Dependent Claim
27 words
The cartridge of claim 1 wherein said base member defines film guide rails for guiding said film from the film receiving means to said film drive means.
Claim 8
Dependent Claim
59 words
The cartridge of claim 1 wherein said film drive means further comprises a film drive spool having a central hub and a pair of spaced flanges, said hub being mounted for rotation with respect to said housing means and wherein said flanges define a plurality of spaced sprocket teeth for driving engagement with the sprocket holes of said film.
Claim 9
Dependent Claim
29 words
The cartridge of claim 7 wherein said housing means further comprises a cover means housing said film and means for removably connecting said cover means to said base member.
Claim 10
Dependent Claim
27 words
The cartridge of claim 8 further including guide means positioned adjacent said drive spool for assuring the proper threading of said film with respect to said spool.
Claim 11
Dependent Claim
27 words
The cartridge of claim 9 wherein said base member includes sprocket hole guides for assuring the proper seating of said sprocket teeth with said film sprocket holes.
References Cited (Backward Citations)
US2172812A
Cited
US3252372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |