Appeal No. 97-1398
Application 08/295,225
regardless of which side of the tape is contacted by the capstan.
As shown in Figure 5, the length L of the leader portion is long
enough to permit the microabrasive material to reach capstan 18
but short enough to prevent it from reaching the magnetic heads
(not shown), which could be damaged by this material (Spec.
at 10, line 32-37). The two abrasive layers on the leader
portion can be formed of the same or different materials (Spec.
at 9, line 37 to Spec. at 10, line 1).
The front side of the magnetically recordable tape portion
34 (Fig. 3) carries a layer 46 of magnetically recordable dry
scrubbing material thereon for simultaneously cleaning the rotary
head and causing the display of recorded audio and video
instructions on a television receiver (Spec. at 9, lines 7-10;
Spec. at 11, lines 19-24). As is apparent from Figures 1 and 3,
this layer of cleaning material also cleans the tape guides
(i.e., pins and rollers) that contact the front side of the tape.
The back side of the magnetically recordable tape portion 34 can
be provided with have a layer 48 of dry scrubbing material for
cleaning the tape guides that contact the other side of the tape
(Spec. at 9, line 10). The front and back scrubbing layers 46
and 48 differ from each other in that the front layer includes
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Last modified: November 3, 2007