Shoe with improved dual hardness heel-lift

Details Shoe with improved dual hardness heel-lift Shoe with improved dual hardness heel-lift

1993-06-16

1994-07-05

Sewell, Paul T.

Boots, shoes, and leggings

Heels

36 34A, A43B 2100

Patent

active

053256123

ABSTRACT:
The present invention relates to a shoe having an improved unitary dual hardness dowel-lift with superior wear and non-slip characteristics. The dual hardness dowel-lift includes a hard polyurethane top portion and a soft polyurethane bottom portion. The bottom portion is cast onto the top portion. The bottom portion is a softer material which possesses a hardness lower than the top portion as measured by the Shore A Hardness test, and preferably is a thermoset polyurethane elastomer.

REFERENCES:
patent: 2908089 (1959-10-01), Ciaio
patent: 2932098 (1960-04-01), Lange
patent: 2990627 (1961-07-01), Stubbe
patent: 3034234 (1962-05-01), Portelli
patent: 3035358 (1962-05-01), Ross
patent: 3144722 (1964-08-01), Cortina
patent: 3174235 (1965-03-01), Johnston
patent: 3216133 (1965-11-01), Houle
patent: 3261115 (1966-07-01), Manze
patent: 3268643 (1966-08-01), Katzenmeyer
patent: 4345058 (1982-08-01), Dettling
patent: 4922629 (1990-05-01), Bouchet

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