US4449800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable overhead projector
Assignee: BUHL INDUSTRIES INC A CORP OF NJ
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Filing: 1983-01-26
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Granted: 1984-05-22
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Expires: 2003-01-26
Abstract
Abstract A portable overhead projector comprises a rectangular box-like housing having an open top and four side walls, a projecting lamp disposed in the housing and a planar fresnel lens. The fresnel lens is mounted in the housing for pivotal movement from a storage position wherein the fresnel lens is adjacent the open top of the housing to an operative position wherein the fresnel lens is spaced above the open top of the housing and the projecting lamp. A projecting head assembly is mounted to the housing when the fresnel lens is in the operative position to dispose the projecting head assembly thereabove and a cover is connectable to the housing for covering the fresnel lens when in the storage position.
Inventors
- 👤 Vincent E. De Longis
- 👤 Henry Kyhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:45
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
223 words
A portable overhead projector comprising: a housing having an open top, a first side wall, a second side wall, a third side wall, and a fourth side wall, said sidewalls defining said housing, said first side wall and said second side wall being opposite each other, and said third side wall and said fourth side wall being opposite each other; a projecting lamp disposed in the housing; a planar lens; lens mounting means for mounting the lens on the housing for pivotal movement from a storage position wherein the lens is adjacent the open top of the housing to an operative position wherein the lens is spaced above the open top of the housing and the projecting lamp, said lens mounting means including a rectangular lens frame, a first member hingedly connected to one edge of the frame and to the upper portion of the first side wall, and a second said member hingedly connected to the opposite edge of the frame and to said housing at a point spaced from said second side wall; a projector head assembly; projector mounting means for operationally mounting the projector head assembly on the housing when the lens is in the operative position to dispose the projector head assembly thereabove; and a cover connectable to the housing for covering the lens when in the storage position.
Claim 2
Dependent Claim
223 words
A portable overhead projector comprising: a housing having an open top, a first side wall, a second side wall, a third side wall, and a fourth side wall, said sidewalls defining said housing, said first side wall and said second side wall being opposite each other, and said third side wall and said fourth side wall being opposite each other; a projecting lamp disposed in the housing; a planar lens; lens mounting means for mounting the lens on the housing for pivotal movement from a storage position wherein the lens is adjacent the open top of the housing to an operative position wherein the lens is spaced above the open top of the housing and the projecting lamp, said lens mounting means including a rectangular lens frame, a first member hingedly connected to one edge of the frame and to the upper portion of the first side wall, and a second said member hingedly connected to the opposite edge of the frame and to said housing at a point spaced from said second side wall; a projector head assembly; projector mounting means for operationally mounting the projector head assembly on the housing when the lens is in the operative position to dispose the projector head assembly thereabove; and a cover connectable to the housing for covering the lens when in the storage position.
Claim 3
Dependent Claim
21 words
The projector according to claim 1, wherein said housing is of rectangular box-like shape, and said lens comprises a fresnel lens.
Claim 4
Dependent Claim
52 words
The projector according to claim 2, wherein the distance between the hinged connections of said first member is equal to the distance between the hinged connections of said second member, said distance being equal to the spacing between the second sidewall and the hinged connection of the second member to the housing.
Claim 5
Dependent Claim
28 words
The projector according to claim 2, wherein the first member is configured to form a portion of the cover when the lens is pivoted into the storage position.
Claim 6
Dependent Claim
17 words
The projector according to claim 2, wherein the second member is rectangular and has vent holes therein.
Claim 7
Dependent Claim
32 words
The projector according to claim 2, further comprising a separating wall disposed at the connection of the second member to the housing to define a storage compartment for the projector head assembly.
Claim 8
Dependent Claim
18 words
The projector according to claim 2, further comprising means for releasably locking the lens into the operative position.
Claim 9
Dependent Claim
38 words
The projector according to claim 8, wherein the releasable locking means comprises at least one pair of lever arms pivotably connected together at one end and pivotally connected to the frame and housing at the other ends thereof.
Claim 10
Dependent Claim
71 words
The projector according to claim 1, wherein the means mounting the projector head assembly comprises a support arm fixed to the first member to be disposed in the plane of the cover when the frame is in the storage position and to be disposed generally upwardly when the lens is in the operative position and means for connecting the projector head assembly to the support arm when in the upward position.
Claim 11
Dependent Claim
47 words
The projector according to claim 9, wherein the cover includes the first member and comprises a rectangular box-like member positionable on the top of the housing adjacent the first member to completely cover same and includes an indentation in the surface thereof for receiving the support arm.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |