Title: Alteration-sensitive surface

Abstract: This invention provides an article having an alteration-sensitive surface, generally a sheet material formed of spun continuous strands of fine interconnected fibres of polyolefin, which are bonded together with heat and pressure. The surface of the sheet material is degraded by utilizing solvents, prior to imprinting desired information onto the surface, the surface then being easily abraded so as to substantially prevent alteration without permanently changing the appearance of the surface. Preferably, the surface of the sheet material is overall coated, or imprinted, with a contrasting color such that by abrading the surface the imprint is erased and the white or other natural color of the olefin fibres appears, thus increasing the visibility of the abraded surface.

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Inventors: Bernstein, Donald J. (Fairlawn, NJ, US)

Application Number: 534726
Filing Date: 1974-12-20
Publication_date: 1977-09-27
Assignee:
Primary Class(es): 442/170 283/114, 427/7, 427/336, 428/206, 428/207, 428/409, 428/916
Other Classes:
US Patent Ref:

2260543	Oct, 1941	Smith	8/180.
2829118	Apr, 1958	Wehr	8/180.
3046076	Jul, 1962	Upshur	8/180.
3367150	Feb, 1968	Smith et al.	8/94.
3502495	Mar, 1970	Akamatsu	106/32.
3512913	May, 1970	Day et al.	8/94.
3644080	Feb, 1972	McCullough	8/174.

Other Refs:
Primary Examiner: Bell, James J.
Assistant Examiner:
Attorney: Lackenbach, Lilling & Siegel