Patent US4795252A successfully refreshed from Google Patents.
US4795252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead projector
Assignee: BUHL INDUSTRIES Inc
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Filing: 1987-05-26
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Granted: 1989-01-03
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Expires: 2007-05-26
Abstract
Abstract A portable overhead projector has a top surface which slopes downwardly from the rear wall to the front wall and includes stops on the top surface adjacent to the front wall for preventing a transparency from sliding off the top surface during use and to preset the distance of the leading edge of the transparency from the bottom edge of the protecting wall.
Inventors
- 👤 Henry Kyhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:57
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03; Y10S353/05; Y10S353/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
In an overhead projector having a housing having a light source therein and including a base for resting on a horizontal surface, a rear wall, a front wall and a top surface having a projection area on which a transparency maybe disposed and through which light passes from the light source, the improvement wherein the top surface slopes downwardly from the rear wall to the front wall and further comprising rotatable and infinitely variable stop means on the top surface adjacent the front wall engageable with the edge of a transparency in a selected one of said infinitely variable positions for aligning the transparency with said projection area, said stop means including adjustable stop means for presetting the distance of a leading edge of transparency from the front wall, said adjustable stop means comprising two spaced apart rods each rotatably mounted on said top surface about an axis disposed perpendicular to the top surface and the longitudinal axis of the rod and intermediate the ends thereof.
Claim 2
Dependent Claim
166 words
In an overhead projector having a housing having a light source therein and including a base for resting on a horizontal surface, a rear wall, a front wall and a top surface having a projection area on which a transparency maybe disposed and through which light passes from the light source, the improvement wherein the top surface slopes downwardly from the rear wall to the front wall and further comprising rotatable and infinitely variable stop means on the top surface adjacent the front wall engageable with the edge of a transparency in a selected one of said infinitely variable positions for aligning the transparency with said projection area, said stop means including adjustable stop means for presetting the distance of a leading edge of transparency from the front wall, said adjustable stop means comprising two spaced apart rods each rotatably mounted on said top surface about an axis disposed perpendicular to the top surface and the longitudinal axis of the rod and intermediate the ends thereof.
Claim 3
Dependent Claim
69 words
The projector according to claim 1, further comprising an overhead lens, and support means mounting the overhead lens in projecting position over said projection area, said support means comprising a support bar connected to said housing, and a support member connected between said support bar and said lens, and connecting means for connecting said support bar to said housing for movement between an operating position and a storage position.
Claim 4
Dependent Claim
38 words
The projector according to claim 2, wherein the means connecting the support bar to the housing includes a slot slidably receiving said bar therein, and clamping means for clamping said bar in a desired position in said slot.
Claim 5
Dependent Claim
16 words
The projector according to claim 2, further comprising a reading light disposed on the overhead lens.
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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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |