Patent US5073023A successfully refreshed from Google Patents.
US5073023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead projector display
Assignee: Individual
•
Filing: 1990-01-04
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Granted: 1991-12-17
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Expires: 2010-01-04
Abstract
Abstract An overhead projector for transparencies is provided, and includes a conventional top glass or other transparent plate. The overhead projector also includes a conventional optical system including a projection light path. An additional glass or the like plate is supported above the top conventional glass plate and supports a transparency for projection. A masking member is provided either above or below the transparency. The masking member is movable to cover portions of the transparency while uncovering other portions thereof to project selected portions of the transparency at any given time. In addition an arrow or other message carrying unit is provided which may be above or below the transparency, and which is movable to direct attention to a particular area of the transparency.
Inventors
- 👤 Alvan D. Arsem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:00
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
Apparatus for projecting transparencies including a housing having means providing a projection light path, a projection optical system in said light path interconnected with said housing, means connected to said housing for supporting a transparency to be projected in said light path, masking means interconnected with said housing and disposed across said light path, and means for moving said masking means selectively to uncover portions of said transparency while covering other portions thereof and thus to project only selected portions of said transparency at any given time, and further including an indicating member disposed in said light path, means providing an axis of rotation for said member lying in said light path and oriented in the same direction as said light path, and means for moving said member rectilinearly and also rotationally about said axis of rotation to point at a selected area of said transparency from any direction to direct attention to a selected area of said transparency.
Claim 2
Dependent Claim
159 words
Apparatus for projecting transparencies including a housing having means providing a projection light path, a projection optical system in said light path interconnected with said housing, means connected to said housing for supporting a transparency to be projected in said light path, masking means interconnected with said housing and disposed across said light path, and means for moving said masking means selectively to uncover portions of said transparency while covering other portions thereof and thus to project only selected portions of said transparency at any given time, and further including an indicating member disposed in said light path, means providing an axis of rotation for said member lying in said light path and oriented in the same direction as said light path, and means for moving said member rectilinearly and also rotationally about said axis of rotation to point at a selected area of said transparency from any direction to direct attention to a selected area of said transparency.
Claim 3
Dependent Claim
14 words
Apparatus as set forth in claim 1 wherein said indicating member comprises an arrow.
Claim 4
Dependent Claim
21 words
Apparatus as set forth in claim 1 and further including means for moving said indicating member independently of said masking means.
Claim 5
Dependent Claim
28 words
Apparatus as set forth in claim 1 and further including a display item, and means on said indicating member for replaceably carrying said display item for projection thereof.
Claim 6
Dependent Claim
155 words
Apparatus for projecting transparencies including a housing having means providing a projection light path, a projection optical system in said light path interconnected with said housing, means connected to said housing for supporting a transparency to be projected in said light path, masking means interconnected with said housing and disposed across said light path, and means for moving said masking means selectively to uncover portions of said transparency while covering other portions thereof and thus to project only selected portions of said transparency at any given time, and further including means for moving said member rectilinearly and also rotationally to direct attention to a selected area of said transparency, said indicating member comprising an arrow, and further including a peripheral flange on said indicating member and including a light transmitting area on said indicating member, and a display item fitting within said flange and aligned with said light transmitting area to project said display item.
Claim 7
Dependent Claim
155 words
Apparatus for projecting transparencies including a housing having means providing a projection light path, a projection optical system in said light path interconnected with said housing, means connected to said housing for supporting a transparency to be projected in said light path, masking means interconnected with said housing and disposed across said light path, and means for moving said masking means selectively to uncover portions of said transparency while covering other portions thereof and thus to project only selected portions of said transparency at any given time, and further including means for moving said member rectilinearly and also rotationally to direct attention to a selected area of said transparency, said indicating member comprising an arrow, and further including a peripheral flange on said indicating member and including a light transmitting area on said indicating member, and a display item fitting within said flange and aligned with said light transmitting area to project said display item.
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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) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |