US3827797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead projector apparatus
Assignee: Individual
•
Filing: 1973-04-02
•
Granted: 1974-08-06
•
Expires: 1993-04-02
Abstract
Abstract An adapter or attachment mechanism is presented for use in a standard overhead projector whereby displays having the illusion of motion can be projected. The adapter has a transparent display platform which houses a movable dot patterned activator sheet and has a dot patterned art sheet on the platform, with this assembly being positioned over the normal light table or display deck of an overhead projector. Transmission of light through the adapter assembly coincidentally with movement of the activator sheet result in the projection of a display having the illusion of motion.
Inventors
- 👤 R Eaves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:14
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/08; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03; Y10S353/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
An adapter for mounting on a light table of projection apparatus, the adapter including: a frame; a pair of transparent plates housed in said frame, one of said plates being intended to receive a transparency having an image to be projected; spacer means holding said plates in spaced apart relationship; an activator sheet between said plates, said activator sheet having a pattern thereon; operating means for moving said activator sheet in a desired path; and access means at one edge of said frame above said one plate to permit access to the side of a transparency facing said one plate.
Claim 2
Dependent Claim
100 words
An adapter for mounting on a light table of projection apparatus, the adapter including: a frame; a pair of transparent plates housed in said frame, one of said plates being intended to receive a transparency having an image to be projected; spacer means holding said plates in spaced apart relationship; an activator sheet between said plates, said activator sheet having a pattern thereon; operating means for moving said activator sheet in a desired path; and access means at one edge of said frame above said one plate to permit access to the side of a transparency facing said one plate.
Claim 3
Dependent Claim
19 words
An adapter as in claim 1 wherein: said operating means includes manually operative means attached to said activator sheet.
Claim 4
Dependent Claim
21 words
An adapter as in claim 2 wherein: said manually operative means is a switch housed in a recess in said frame.
Claim 5
Dependent Claim
26 words
An adapter as in claim 2 including: motion transmitting means connected to said activator sheet, said manually operative means being connected to said motion transmitting means.
Claim 6
Dependent Claim
22 words
An adapter as in claim 1 wherein: said operating means includes motor means on said frame for automatically moving said activator sheet.
Claim 7
Dependent Claim
22 words
An adapter as in claim 5 including: cam means operated by said motor; and cam follower means connected to said activator sheet.
Claim 8
Dependent Claim
17 words
An adapter as in claim 6 including: spring means urging said follower into contact with said cam.
Claim 9
Dependent Claim
25 words
An adapter as in claim 7 including: motion transmitting means connected to said activator sheet, said cam follower being connected to said motion transmitting means.
Claim 10
Dependent Claim
17 words
An adapter as in claim 1 including: guide means for guiding the movement of said activator sheet.
Claim 11
Dependent Claim
22 words
An adapter as in claim 9 wherein: said guide means includes pins projecting from said frame iNto slots in said activator sheet.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |