Plastic article or earthenware shaping or treating: apparatus – With means applying coating material to work or work contact... – To work contact means upstream of shaping means
Reexamination Certificate
2004-12-09
2008-08-12
Gupta, Yogendra N. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
With means applying coating material to work or work contact...
To work contact means upstream of shaping means
C425S106000, C425S214000, C425S289000, C425S318000, C427S337000
Reexamination Certificate
active
07410351
ABSTRACT:
A method and apparatus for creating pre-stressed zones in concrete. In one embodiment, a circular blade is coated with a chemical which retards the setting of the concrete. The circular blade is then rolled through the wet concrete, thus transferring the retarding chemical from the blade into the concrete. The region of wet concrete that has the retarding chemical introduced into it does not set until after the surrounding concrete has set and shrunk, thus creating a pre-stressed zone which typically manifests itself as a crack, visible upon setting of the wet concrete. Other embodiments describe alternative ways of introducing the chemical into the wet concrete.
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Bodawala Dimple
Gupta Yogendra N.
Peacock Deborah A.
Peacock & Myers, P.C.
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