Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Reexamination Certificate
2000-06-30
2003-03-25
Loney, Donald J. (Department: 1772)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
C359S530000
Reexamination Certificate
active
06537649
ABSTRACT:
BACKGROUND OF THE INVENTION
Retroreflective materials are commonly employed for safety and decorative purposes. One type of retroreflective material is formed of molded members having very small prisms or cube corner formations. See, for example, U.S. Pat. No. 3,810,804.
It is often desirable to apply these materials to pre-existing structures; in which case, the retroreflective material may not be compatible with the material of the pre-existing structure or the method of application may be destructive of the retroreflective properties.
A need exists, therefore, for a retroreflective system and process in which the retroreflective material may be fabricated to facilitate permanent transfer to existing structures of different material without damaging the retroreflective material.
SUMMARY OF THE INVENTION
A method and apparatus for forming retroreflective material on a substrate are described in which a release coating is formed on a base material and an array of solid light transparent prisms are formed on the coating by casting the prism array in a plastic oligomer which is adhered to the coating.
The prisms are then made reflective by forming a metal layer on the prisms.
In one embodiment, an adhesive is then applied to the reflective metal layer. A substrate is then applied to the adhesive and the base material is removed at the release coating, leaving an exposed array of free-standing retroreflective prisms, that is prisms with a reflective metal backing affixed to the substrate. In an alternate embodiment, before the adhesive is applied, the prism array may be stripped from the base material at the release coating, thereby freeing the individual prisms in the array. The freed prisms may then be dispersed in a paint or a transparent binder for example, for the purpose of printing retroreflective images on fabrics or painting various substrates.
The substrate is preferably formed of the same material as the structure upon which the retroreflective material is to be secured or is compatible with such structure. For example, the substrate may comprise a sheet of synthetic resin, such as polyvinyl chloride (PVC), polyamide, polypropylene, polycarbonate, or fabrics such as polyester, nylon, or the like, coated with a suitable resin.
Preferably, the substrate with the exposed prism layer may then be covered with a transparent protective layer on the exposed side and the substrate may then be bonded by various well-known techniques to a pre-existing structure of the same or similar material as the substrate.
Alternatively, the adhesive may be a heat activated adhesive applied to the array before metallization. Strips spaced across the length of the array sheeting may then be laminated to a substrate leaving an air space between the array and substrate backing to provide a low cost retroreflective sheet on a suitable substrate fabric.
REFERENCES:
patent: 1671086 (1928-05-01), Stimson
patent: 2380447 (1945-07-01), Jungersen
patent: 3684348 (1972-08-01), Rowland
patent: 3689346 (1972-09-01), Rowland
patent: 3810804 (1974-05-01), Rowland
patent: 3811983 (1974-05-01), Rowland
patent: 3830682 (1974-08-01), Rowland
patent: 3935359 (1976-01-01), Rowland
patent: 3971692 (1976-07-01), Anderson
patent: 3975083 (1976-08-01), Rowland
patent: 4075049 (1978-02-01), Wood
patent: 4202600 (1980-05-01), Burke et al.
patent: 4243618 (1981-01-01), Van Arnam
patent: 4244683 (1981-01-01), Rowland
patent: 4349598 (1982-09-01), White
patent: 4555161 (1985-11-01), Rowland
patent: 4721649 (1988-01-01), Belisle et al.
patent: 4801193 (1989-01-01), Martin
patent: 5050924 (1991-09-01), Hansen
patent: 5084782 (1992-01-01), Taylor
patent: 5117304 (1992-05-01), Huang et al.
patent: 5171624 (1992-12-01), Walter
patent: 5200262 (1993-04-01), Li
patent: 5202168 (1993-04-01), Turner et al.
patent: 5207852 (1993-05-01), Lightle et al.
patent: 5223312 (1993-06-01), Langille
patent: 5229882 (1993-07-01), Rowland
patent: 5254390 (1993-10-01), Lu
patent: 5256721 (1993-10-01), Wilson et al.
patent: 5262225 (1993-11-01), Wilson et al.
patent: 5264063 (1993-11-01), Martin
patent: 5300263 (1994-04-01), Hoopman et al.
patent: 5415911 (1995-05-01), Zampa et al.
patent: 5491586 (1996-02-01), Phillips
patent: 5637173 (1997-06-01), Martin et al.
patent: 5786066 (1998-07-01), Martin et al.
patent: 5805339 (1998-09-01), Martin et al.
patent: 5831766 (1998-11-01), Martin et al.
patent: 6050691 (2000-04-01), Fellows et al.
patent: 1303103 (1973-01-01), None
patent: 2254826 (1992-10-01), None
patent: 2255313 (1992-11-01), None
patent: WO93/10985 (1993-06-01), None
patent: WO94/19711 (1994-09-01), None
Letter from Hugh Rowland, Chairman Reflexite Corporation to Mr. Robert L. Davidson, Chief Chemist, Harrisburg, Pennsylvania Department of Transportation, dated Oct. 7, 1988, regarding “Diamond Dust.”
Letter from Hugh Rowland, Chairman, Reflexite Corporation to Mr. Kare Rumar, Swedish Road and Traffic Research Institute, dated Oct. 7, 1988, regarding “Diamond Dust”.
Letter from Hugh Rowland, Chairman, Reflexite Corporation to Mr. Kare Rumar, Swedish Road and Traffic Research Institute, dated Nov. 4, 1988, making reference to a sample powder.
Letter from Hugh Rowland, Chairmen Reflexite Corporation to Mr. Taira Nakane, Nakene Company Ltd., dated Nov. 8, 1988, regarding “Diamond Dust” Free Prisms.
Facsimile from M. Kubo, Nakane Co., Ltd. to Timothy Podrotty, Reflexite Corporation, dated Nov. 10, 1988, making reference to “Diamond Dust”.
Nakane Co., Ltd., Tokyo Japan, Purchase Order No. 8-41/REF dated Nov. 10, 1988, ordering merchandise from Reflexite Corporation, together with Reflexite Corporation Shipping Order No. R28351 and Invoice No. 28767 dated Nov. 21, 1988 regarding same.
Websters Dictionary 10thedition 1 page 64.
Martin David C.
Phillips Edward D.
Rowland William P.
Hamilton Brook Smith & Reynolds P.C.
Loney Donald J.
Reflexite Corporation
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