US3785729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead projector roller assembly
Assignee: Individual
•
Filing: 1971-03-01
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Granted: 1974-01-15
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Expires: 1991-03-01
Abstract
Abstract A roller device for use with an overhead projector comprises a frame having a roller mounted at each end. The frame is designed to be positionable on the horizontal ground glass optical member or lens of the typical overhead projector. The rollers are positioned on the frame at a point where the frame extends beyond the horizontal optical member of the projector, and the rollers are further positioned in a plane slightly below the plane of the horizontal member so that a sheet of transparent writing material as described above may move from its supply position on each roller and be parallel to and in close proximity to the optical member of the projector as it passes over that member. Thus, indicia may be placed upon the transparent writing material at will.
Inventors
- 👤 C Dasher
- 👤 K Dasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:15
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
194 words
A roller device for use with an overhead projector having a display area between a source of illumination and light-directing means, said device for resting unattachably upon said projector and comprising a wire frame comprising a pair of side members secured to a pair of transverse members in a manner to form a central portion positionable adjacent to and parallel to said display area, said central portion having an opening therein to permit passage of light from said source of illumination, said side members extending outwardly and downwardly to form two end portions said two end portions being located in a different plane than said central portion, said plane being spaced below and parallel to the plane of said central portion, and roller means for holding a supply of transparent sheet material upon which indicia may be recorded, means mounting said roller means on each of said end portions, the radial size of said roller means being substantially equal to the spacing between the planes of the central and end portions whereby the circumference of said roller means when mounted on said end portions is substantially tangential to the plane of said central portion.
Claim 2
Dependent Claim
194 words
A roller device for use with an overhead projector having a display area between a source of illumination and light-directing means, said device for resting unattachably upon said projector and comprising a wire frame comprising a pair of side members secured to a pair of transverse members in a manner to form a central portion positionable adjacent to and parallel to said display area, said central portion having an opening therein to permit passage of light from said source of illumination, said side members extending outwardly and downwardly to form two end portions said two end portions being located in a different plane than said central portion, said plane being spaced below and parallel to the plane of said central portion, and roller means for holding a supply of transparent sheet material upon which indicia may be recorded, means mounting said roller means on each of said end portions, the radial size of said roller means being substantially equal to the spacing between the planes of the central and end portions whereby the circumference of said roller means when mounted on said end portions is substantially tangential to the plane of said central portion.
Claim 3
Dependent Claim
32 words
A roller device for use with an overhead projector as described in claim 1, wherein said central portion includes support means to position said frame member slightly away from said display area.
Claim 4
Dependent Claim
32 words
A roller device for use with an overhead projector as described in claim 2, wherein said means mounting said roller means includes means removably mounting said roller means on each end portion.
Claim 5
Dependent Claim
35 words
A roller device for use with an overhead projector as described in claim 3, wherein said roller means includes a roller member attached to an axle and an axle thereof extends to a crank member.
Claim 6
Dependent Claim
32 words
A roller device for use with an overhead projector as described in claim 4, wherein said removable mounting means includes a clip member holding said axle in position on said end portion.
Claim 7
Dependent Claim
31 words
A roller device for use with an overhead projector as described in claim 5, wherein said roller member includes spring means to hold a roll of said transparent material in position.
References Cited (Backward Citations)
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |