US4550978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-dimensional viewing device
Assignee: Individual
•
Filing: 1984-05-07
•
Granted: 1985-11-05
•
Expires: 2004-05-07
Abstract
Abstract A hand-held viewing device is provided which creates a stereoscopic illusion when flat subject matter is viewed. The device is comprised of a housing which defines two parallel and identical rectangular channels in contiguous side-by-side juxtaposition, and confines first and second flat reflectors which shift upwardly the line of sight through said channels.
Inventors
- 👤 Alvin A. Friedle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:29
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/04; G02B30/00; G02B30/20; G02B30/34; G02B30/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
A viewing device for creating a stereoscopic effect comprising: (a) an elongated housing of generally rectangular cross-sectional contour having a partially open eye-directed extremity and fully open subject-directed extremity, upper and lower surfaces and opposed side panels, and a plane of symmetry that extends in the direction of elongation and perpendicularly bisects said upper and lower surfaces, (b) a divider panel positioned within said housing and perpendicularly disposed between upper and lower surfaces within said plane of symmetry in a manner to form two separate and identical viewing channels of rectangular cross-sectional configuration, (c) first flat reflector means mounted at that extremity of each of said viewing channels which is closest to the eye-directed extremity of the housing, said reflector means being perpendicularly disposed between said panels and forming an upwardly opening angle of about 135° with respect to the center axis of elongation of each viewing channel, and (d) second flat reflector means mounted directly above said first reflector means and parallel thereto, and adapted to receive light from said first reflector means and re-direct said light out of the eye-directed extremity of said housing on a path parallel to the axes of said channels.
Claim 2
Dependent Claim
196 words
A viewing device for creating a stereoscopic effect comprising: (a) an elongated housing of generally rectangular cross-sectional contour having a partially open eye-directed extremity and fully open subject-directed extremity, upper and lower surfaces and opposed side panels, and a plane of symmetry that extends in the direction of elongation and perpendicularly bisects said upper and lower surfaces, (b) a divider panel positioned within said housing and perpendicularly disposed between upper and lower surfaces within said plane of symmetry in a manner to form two separate and identical viewing channels of rectangular cross-sectional configuration, (c) first flat reflector means mounted at that extremity of each of said viewing channels which is closest to the eye-directed extremity of the housing, said reflector means being perpendicularly disposed between said panels and forming an upwardly opening angle of about 135° with respect to the center axis of elongation of each viewing channel, and (d) second flat reflector means mounted directly above said first reflector means and parallel thereto, and adapted to receive light from said first reflector means and re-direct said light out of the eye-directed extremity of said housing on a path parallel to the axes of said channels.
Claim 3
Dependent Claim
20 words
The viewing device of claim 1 wherein said flat reflector means are single integral mirrors which span both viewing channels.
Claim 4
Dependent Claim
27 words
The viewing device of claim 2 wherein the ratio of the length of said channels to the diagonal of their cross sections is between 3.0 and 6.0.
Claim 5
Dependent Claim
31 words
The viewing device of claim 3 wherein the distance of separation between the center axes of elongation of the channels and the re-directed light path is between 1.0 and 3.0 inches.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |