Interference No. 103,669
corroborate this conception date. SR11; SR14. Therefore, we
credit Steitz with a corroborated conception as of April 30,
1994.
Steitz further states that he requested that his son
make a drawing of the invention, which drawing was completed
by at least August 24, 1994. SR3. The drawing is SX-1. The
date that this drawing was completed is corroborated by
Matthew Steitz, whose initials appear on the drawing near the
date. SR3; SR14.
Steitz then constructed a prototype of the
invention. The prototype was completed by November 5, 1994.
SR3. The prototype is shown in photographs: SX-2, SX-3, SX-
4.
Mrs. Steitz corroborates the completion of the prototype
and appears in one of the photographs. SR11; SX-2.
Steitz conducted tests of the prototype with the
assistance of witness Gales in November, a few days after the
prototype was constructed. SR4. Gales confirms the tests
were conducted in November and agrees with Steitz that the
device worked for its intended purpose. SR17. Based on this
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