US3926514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector loading-unloading station
Assignee: Bell and Howell Co
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Filing: 1971-07-06
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Granted: 1975-12-16
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Expires: 1991-07-06
Abstract
Abstract A slide projector loading station having a support for a slide magazine and a collection chamber underlying the slide magazine. An expansible retainer is interposed between the support and the chamber to prevent slides from entering the chambers directly. The retainer is positioned to support the lowermost slide of the stack in the magazine while the slides are being projected. A platform in the chamber raises the projected slides past the retainer into the magazine.
Inventors
- 👤 Carl C Costanza
- 👤 Walter W Weber
- 👤 Frank W Betlejewski
- 👤 Richard Frystak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:15
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/06; G03B23/04; G03B23/046; G03B23/08; G03B23/10; G03B23/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
In a slide projector the combination comprising: means for supporting a magazine containing a horizontally oriented stack of slides to be projected; a collection chamber, having an open end underlying said support means, for collecting said stack of slides after projection in said projector; pivoted retaining means disposed between said magazine and said open end of said collection chamber; elastic means for urging said retaining means into a position such that the lowermost slide in said stack is supported by said retaining means during projection of said stack and the slides in said stack are prevented from passing directly from said magazine to said collection chamber; means for transporting the slides in said stack to a projection station and then to said collection chamber; anD means within said collection chamber for returning the projected slides to said magazine by moving said retaining means in opposition to said elastic means to permit the passage of said projected slides.
Claim 2
Dependent Claim
157 words
In a slide projector the combination comprising: means for supporting a magazine containing a horizontally oriented stack of slides to be projected; a collection chamber, having an open end underlying said support means, for collecting said stack of slides after projection in said projector; pivoted retaining means disposed between said magazine and said open end of said collection chamber; elastic means for urging said retaining means into a position such that the lowermost slide in said stack is supported by said retaining means during projection of said stack and the slides in said stack are prevented from passing directly from said magazine to said collection chamber; means for transporting the slides in said stack to a projection station and then to said collection chamber; anD means within said collection chamber for returning the projected slides to said magazine by moving said retaining means in opposition to said elastic means to permit the passage of said projected slides.
References Cited (Backward Citations)
US3002426A
Cited
US3495902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |