Appeal No. 97-2907
Application 08/314,146
The Chang patent is drawn to a manually powered caulking
gun that includes a pistol-type handle open at the top and
bottom (column 1, lines 42 through 45). All mechanism of the
gun (including first grip 34) is located inside the handle
except the protruding ends of the trigger, release portion,
and plunger (column 2, lines 2 through 4). As explained by
the patentee (column 2, lines 42 through 44), the operative
contact of the trigger with the first grip should be kept
lubricated and this is “highly visible and readily accessible
for inspection and oiling.”
The Handels document (Figs. 1 through 4) teaches a
cylinder 1 that is provided, on the end surrounding the
clamping washers 19 and 27, with an end gable 2, a hanging
floor 3, and an arcuate plate (not numbered) overlying a top
end of the cylinder. A lever 12 passes through an opening 14
in cylinder 1.
Appellant points out (main brief, pages 8 through 10)
that Chang teaches away by disclosing an operating mechanism
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