US4517558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three dimensional video screen display effect
Assignee: International Game Technology
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Filing: 1982-05-03
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Granted: 1985-05-14
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Expires: 2002-05-03
Abstract
Abstract A three dimensional visual effect of rotating mechanical reels is given to a two dimensional display on a video screen by using a film having a continuous tone gradient from dark to light, the darkest portions extending along the upper and lower edges of the film, respectively, with the lightest adjacent the center of the film. The film is placed over the video screen images so that the darkened tone gradients of the film are over the upper and lower portion of the display, and the lighter portion of the film at the center is over the center of the display.
Inventors
- 👤 Robert E. Davids
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:06
CPC Classifications
G; G07; G07F; G07F17/00; G07F17/32; G07F17/3202; G07F17/3204; G07F17/3211; Y; Y10; Y10S; Y10S345/00; Y10S345/905
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A video display apparatus comprising: (a) a view screen showing a display of a plurality of horizontally aligned two dimensional display segments, (b) a mask secured in front of said screen having one or more viewing ports formed thereon for framing said display, and (c) a film secured to the front surface of said screen and covering the entire area of said viewing port said film having only two darkened areas, one extending horizontally across the top and the other horizontally across the bottom of said film, said darkened areas having a continuous tone gradient from darkest along the upper and lower edges of said film to lightest adjacent the center of said film to provide an unshaded horizontal substantially optically clear strip extending across the center of said film, said film being positioned relative to said viewing port so that said substantially clear strip is only along the approximate center thereof, whereby a three dimensional visual effect is given to said two dimensional display segments viewed through said film.
Claim 2
Dependent Claim
170 words
A video display apparatus comprising: (a) a view screen showing a display of a plurality of horizontally aligned two dimensional display segments, (b) a mask secured in front of said screen having one or more viewing ports formed thereon for framing said display, and (c) a film secured to the front surface of said screen and covering the entire area of said viewing port said film having only two darkened areas, one extending horizontally across the top and the other horizontally across the bottom of said film, said darkened areas having a continuous tone gradient from darkest along the upper and lower edges of said film to lightest adjacent the center of said film to provide an unshaded horizontal substantially optically clear strip extending across the center of said film, said film being positioned relative to said viewing port so that said substantially clear strip is only along the approximate center thereof, whereby a three dimensional visual effect is given to said two dimensional display segments viewed through said film.
Claim 3
Dependent Claim
27 words
The video display apparatus of claim 1 wherein said mask comprises a plurality of viewing ports each one for viewing a different one of said display segments.
Claim 4
Dependent Claim
51 words
The video display apparatus of claim 2 wherein said two dimensional display segments comprise a plurality of vertically aligned upper, middle and lower images, said middle images visible through said clear strip of said film and said upper and lower images through upper and lower darkened areas of said film, respectively.
Claim 5
Independent Claim
38 words
The apparatus of claims 1, 2, or 3 wherein the darkest portion of said continuous tone gradient of said film is substantially opaque along upper and lower edges of said film and said clear strip is substantially transparent.
Claim 6
Dependent Claim
97 words
In a video display apparatus having a sereen displaying a plurality of two dimensional images, the improvement comprising a film secured on the surface of said screen having a first and a second continuous tone gradient from substantially opaque to substantially transparent, said first and second tone gradients being disposed only along upper and lower portions of said film respectively, and extending between top and bottom edges thereof, said tone gradients being darkest adjacent said top and bottom edges of said film and substantially transparent along a center portion extending between opposite side edges of said film.
Claim 7
Dependent Claim
97 words
In a video display apparatus having a sereen displaying a plurality of two dimensional images, the improvement comprising a film secured on the surface of said screen having a first and a second continuous tone gradient from substantially opaque to substantially transparent, said first and second tone gradients being disposed only along upper and lower portions of said film respectively, and extending between top and bottom edges thereof, said tone gradients being darkest adjacent said top and bottom edges of said film and substantially transparent along a center portion extending between opposite side edges of said film.
Claim 8
Dependent Claim
28 words
The apparatus of claim 5 wherein said two dimensional images are horizontally aligned whereby the center of said images are located along said center portion of said strip.
Claim 9
Dependent Claim
102 words
A video display apparatus comprising: a video screen displaying a plurality of horizontally aligned two dimensional images, a film secured on the front surface of said screen, said film having only an upper and lower continuous tone gradient from substantially opaque darkness along an upper and lower edge, respectively, of said film to substantially transparent along a center portion thereof, said center portion being substantially uniform between said edges of said film and located over the horizontal center of said images, and a mask secured in front of said screen and said film having one or more viewing ports framing said images.
Claim 10
Dependent Claim
102 words
A video display apparatus comprising: a video screen displaying a plurality of horizontally aligned two dimensional images, a film secured on the front surface of said screen, said film having only an upper and lower continuous tone gradient from substantially opaque darkness along an upper and lower edge, respectively, of said film to substantially transparent along a center portion thereof, said center portion being substantially uniform between said edges of said film and located over the horizontal center of said images, and a mask secured in front of said screen and said film having one or more viewing ports framing said images.
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |