Appeal No. 95-0931
Application No. 08/070,638
a linear center strip interposed between and connected along
its sides with a pair of laterally spaced linear side strips,
said center strip being at least 10 percent larger in thickness
than each of said side strips;
said center strip consisting essentially of a compounded
butyl rubber adhesive sealant which is non-crosslinked, whereby
said center strip exhibits good dimensional stability at room
temperature and whereupon application of said sealing tape to a
seam, under heat, pressure or both heat and pressure, said center
strip flows freely into and seals said seam;
said side strips consisting essentially of a compounded
elastomeric rubber composition which is at least partially
crosslinked, whereby said side strips exhibit resilience and
dimensional stability at both room temperature conditions and
upon application of heat, pressure or both heat and pressure;
and wherein said tape is preassembled, whereby said side
strips are adhered to said center strip prior to application of
said tape to said seam.
The examiner relies upon the following references as
evidence of obviousness:
Van Ornum et al. (Van Ornum) 4,113,799 Sept. 12, 1978
Sheahan 5,093,171 Mar. 3, 1992
(filed Mar. 6, 1989)
Appellant's claimed invention is directed to a multi-
component sealing tape that is used for sealing lapped or butted
seams between adjacent elastomeric substrates, such as roofing
membranes. The tape comprises a linear center strip consisting
essentially of non-crosslinked butyl rubber adhesive sealant that
is interposed between laterally spaced side strips consisting
essentially of partially crosslinked elastomeric rubber. Upon
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