Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1989-02-22
1990-12-18
Ryan, Patrick
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
428196, 428212, 4284231, 428500, 428515, 428908, 434408, 434422, 434423, 434424, 434425, B32B 900
Patent
active
049785680
ABSTRACT:
A flexible writing surface including a coated flexible substrate having a dust collecting cuff around the perimeter thereof to prevent the scattering of chalk dust during use.
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patent: 3497969 (1970-03-01), Schwoegler
patent: 3642562 (1972-02-01), Kawaguchi
patent: 3922457 (1975-11-01), Barnwell et al.
patent: 4052525 (1977-10-01), Ide et al.
patent: 4066820 (1978-01-01), Kelly et al.
patent: 4138523 (1979-02-01), Katsurayama et al.
Hach Associates, Inc.
Jenkins Richard E.
Ryan Patrick
LandOfFree
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