US Patent No: 6,274,221
Number of patents in Portfolio can not be more than 2000
Angular brightness microprismatic retroreflective film or sheeting incorporating a syndiotactic vinyl aromatic polymer
Stats
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Aug 14, 2001
Issued date -
Jan 29, 1999
filing date -
09/240,342
serial no -
In Force
status
Importance
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Abstract
A novel microprismatic retroreflective film or sheeting is provided which comprises a transparent semicrystalline polymer. The microprismatic retroreflective film or sheeting of the present invention offers superior retroreflective brightness at large angles of incidence and at large observational angles. Syndiotactic vinyl aromatic polymers, especially syndiotactic polystyrene and copolymers thereof, are preferred semicrystalline polymers, as they impart good dimensional stability and resistance to moisture, and can be made resistant to UV radiation. Signing materials comprising these microprismatic retroreflective films provide improved performance for off-angle illumination and viewing in traffic control and other signing applications.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,588,258 Cube-corner retroreflective articles having wide angularity in multiple viewing planes | 233 | 1984 | |
| 4,775,219 Cube-corner retroreflective articles having tailored divergence profiles | 183 | 1986 | |
| 4,895,428 High efficiency retroreflective material | 140 | 1988 | |
| 5,138,488 Retroreflective material with improved angularity | 120 | 1990 | |
| 5,754,338 Structured retroreflective sheeting having a rivet-like connection | 34 | 1996 | |
| 5,932,626 Optical product prepared from high index of refraction brominated monomers | 54 | 1997 | |
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| 5,706,132 Dual orientation retroreflective sheeting | 70 | 1996 | |
| 5,783,120 Method for making an optical film | 231 | 1996 | |
| 5,808,794 Reflective polarizers having extended red band edge for controlled off axis color | 166 | 1996 | |
| 6,024,455 Reflective article with concealed retroreflective pattern | 57 | 1998 | |
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| 5,127,158 Process for producing a printed circuit board with a syndiotactic polystyrene support | 33 | 1990 | |
| 5,219,940 Styrene polymer composition | 43 | 1991 | |
| 5,496,919 Process for production of styrene-based polymer moldings | 5 | 1993 | |
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| 5,145,950 Method of storing food or plant materials by wrapping with a stretched syndiotactic polystyrene film | 51 | 1991 | |
| 5,318,839 Laminate with a styrenic polymer layer | 20 | 1992 | |
| 5,476,899 Process for produce a readily slidable film | 17 | 1993 | |
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| 4,486,363 Method and apparatus for embossing a precision optical pattern in a resinous sheet | 108 | 1982 | |
| 4,601,861 Methods and apparatus for embossing a precision optical pattern in a resinous sheet or laminate | 166 | 1984 | |
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| 5,082,717 Styrene-based resin composite material | 14 | 1989 | |
| 5,273,830 Magnetic recording medium comprising a syndiotactic styrene-based polymer substrate, a magnetic layer and a backcoat lubricating layer each layer containing a curable phosphazine compound | 27 | 1991 | |
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| 5,346,950 Resin composition | 41 | 1993 | |
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| 5,990,256 Long chain branched syndiotactic vinyl aromatic polymers | 3 | 1998 | |
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| 6,010,609 Method of making a microprism master mold | 32 | 1998 | |
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| 4,244,683 Apparatus for compression molding of retroreflective sheeting | 75 | 1979 | |
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| 4,332,847 Method for compression molding of retroreflective sheeting and sheeting produced thereby | 68 | 1980 | |
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| 5,654,365 Styrenic polymer composition | 7 | 1996 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 14, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |