Appeal No. 1997-3973
Application No. 08/366,561
19. A method for sensing voltages from a
magnetoresistive sensing element comprising the steps of:
(a) providing a bias current to said
magnetoresistive sensing element during read modes, but not
during at least some write mode;
(b) coupling the AC component of voltage on said
magnetoresistive sensing element out, through one or
more coupling capacitors, to differential input
connections of a differential preamplifier stage; and
(c) shorting together said inputs of said
preamplifier stage, for a limited time, each time a current
generator switches on and initiates the providing of bias
current upon a transition from write mode to read mode.
The references relied on by the examiner are:
Tagiri 5,229,719 Jul. 20, 1993
Heyl et al. (Heyl) 5,424,678 Jun. 13, 1995
(filed Feb. 2,
1994)
Claims 1 through 4, 6 through 16, 18, 19, 21 through
24 and 26 through 29 stand rejected under the first paragraph
of 35 U.S.C. § 112 because Figures 5 and 6A through 6D “are
not relevant to the claimed invention,” “the discussions
thereof are of insufficient detail to be otherwise useful,”
and “serve no purpose but to obfuscate the claimed invention”
(Answer, page 4).
Claims 7 through 10, 12, 19 and 27 through 29 stand
4
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