US3661385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical-illusion device
Assignee: Individual
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Filing: 1970-08-03
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Granted: 1972-05-09
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Expires: 1990-08-03
Abstract
Abstract A device for creating optical illusions comprising a transparent sheet, a plurality of fresnel screens spaced apart and in a regular array on the sheet, a condensing lens formed by each of the fresnel screens and a reflecting surface juxtaposed with the sheet.
Inventors
- 👤 Henry Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:16
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/22; G; G09; G09B; G09B23/00; G09B23/06; G09B23/22; A63F; A63F9/00; A63F9/06; A63F9/0613; A63F2009/0629; A63F2009/0633
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A device for creating optical illusions, comprising a rectangular planar transparent sheet, a plurality of rectangular flat Fresnel screens formed in said sheet, said screens being spaced apart from each other in a rectangular matrix array, the space between said screens defining a lattice of mutually orthogonal clear strips, a rectangular planar continuous reflecting surface adjacent to and parallel with said sheet, said surface being substantially coextensive with said sheet, and a frame surrounding said sheet and said surface for holding said sheet and said surface in a fixed relationship to each other.
Claim 2
Independent Claim
93 words
A device for creating optical illusions, comprising a rectangular planar transparent sheet, a plurality of rectangular flat Fresnel screens formed in said sheet, said screens being spaced apart from each other in a rectangular matrix array, the space between said screens defining a lattice of mutually orthogonal clear strips, a rectangular planar continuous reflecting surface adjacent to and parallel with said sheet, said surface being substantially coextensive with said sheet, and a frame surrounding said sheet and said surface for holding said sheet and said surface in a fixed relationship to each other.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |