US4893906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display forms using liquid crystals
Assignee: Individual
•
Filing: 1988-03-09
•
Granted: 1990-01-16
•
Expires: 2008-03-09
Abstract
Abstract In a display device, planar or curved, panel or colored pane it is known that the image or the colors do not change noticeably with the angle of viewing or angle of illumination. In this invention drastic changes in the image and colors can be obtained using cholesteric or other chiral liquid crystal coatings or polymers with liquid crystalline properties. In addition the colors are more intense than feasible with other colorants. These two properties are value in applications where it is desired to attract the viewers attention such as in advertising and signage. In a colored pane consisting of ornamental or stained glass parts it is known that the process of achieving the desired image effects is not simple and limited in scope. Using liquid crystal coatings the process of achieving such effects is greatly simplified and less expensive. By providing two or more liquid crystal coatings on transparent substrates overlaying each other new colors and three-dimensional effects can be obtained as a result of the color additive properties of liquid crystals coatings which do not absorb light.
Inventors
- 👤 David M. Makow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:53
CPC Classifications
B; B44; B44F; B44F1/00; B44F1/06; B44F1/066; B44F1/08; B44F1/10; C; C09; C09K; C09K19/00; C09K19/04; C09K19/40; C09K19/406; C09K19/408; G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0063; G09; G09F; G09F9/00; G09F9/30; G09F9/35
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A display device comprising a light source, a panel with an interior and exterior surface, said exterior surface exposed to an onlooker and being on the reverse side of said panel, relative to said internal surface, at least a portion of said panel being coated with a liquid crystal coating which has a melting point above its operating temperature, and which is perceived as changing colour with a change in the angle between the line from said onlooker to a point which is viewed on the said exterior surface of said panel and the said exterior surface, or with the change in the angle between a line from said light source to a point on said exterior surface which is being viewed and a said exterior surface.
Claim 2
Dependent Claim
127 words
A display device comprising a light source, a panel with an interior and exterior surface, said exterior surface exposed to an onlooker and being on the reverse side of said panel, relative to said internal surface, at least a portion of said panel being coated with a liquid crystal coating which has a melting point above its operating temperature, and which is perceived as changing colour with a change in the angle between the line from said onlooker to a point which is viewed on the said exterior surface of said panel and the said exterior surface, or with the change in the angle between a line from said light source to a point on said exterior surface which is being viewed and a said exterior surface.
Claim 3
Dependent Claim
19 words
A display device as described in claim 1, wherein said liquid crystal is a polymer having liquid crystaline properties.
Claim 4
Dependent Claim
20 words
A display device as described in claim 2, wherein said liquid crystal is a polysiloxane polymer having liquid crystaline properties.
Claim 5
Dependent Claim
18 words
A display device as described in claim 1, wherein said panel has a planar exterior and/or interior surface.
Claim 6
Dependent Claim
18 words
A display device as described in claim 4, wherein said panel has a nonplanar exterior and/or interior surface.
Claim 7
Dependent Claim
13 words
A display device as described in claim 5, wherein said panel is opaque.
Claim 8
Dependent Claim
27 words
A display device as described in claim 5, wherein said panel is translucent and said coating is coated on said interior surface, said exterior surface or both.
Claim 9
Dependent Claim
27 words
A display device as described in claim 5, wherein said panel is transparent, and said coating is coated on said interior surface, said exterior surface or both.
Claim 10
Dependent Claim
28 words
A display device as described in claim 6, 7 or 8, wherein more than one coating of said liquid crystal on said internal and/or external surface is provided.
Claim 11
Dependent Claim
27 words
A display device as described in claim 6, 7 or 8, wherein said panel is made from a material selected from the group including plastic and glass.
Claim 12
Dependent Claim
22 words
A display device as described in claim 6, 7 or 8, wherein a plurality of said panels are provided overlaying one another.
Claim 13
Dependent Claim
52 words
A display device as described in claim 6, 7 or 8, wherein at least two of said panels are provided, joined together fully or partly overlaying, side-by-side or joined with their surfaces or edges at different angles with respect to each other to form a relief, a sculpture or a jewellery object.
Claim 14
Dependent Claim
34 words
A display device as described in claim 6, 7 or 8, wherein said display device is an advertising, alerting or informative display or sign, suitably framed, supported or enclosed for outdoor or indoor use.
Claim 15
Dependent Claim
20 words
A display device as described in claim 6, 7 or 8, wherein said display device is a decorative window pane.
Claim 16
Dependent Claim
19 words
A display device as described in claim 6, 7 or 8, wherein said display device is a decorative partition.
References Cited (Backward Citations)
US3533399A
Cited
US3666948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |