Reexamination Control No. 90/005,742
Patent 5,253,341
1 Claim 95, which depends on claim 93, adds that "said compressed or non-compressed
2 response comprises an image that has been differentially compressed prior to receipt of said
3 query." The examiner correctly characterizes Pocock column 19, line 27 to column 15, line 15
4 and column 4, lines 39-40 as disclosing that compression occurs prior to receipt of a request. 3d
5 Action at 103, para. 43; Final Action at 257, para. 42. Pocock, in describing presentation system
6 10 (i.e., the central location), explains that "[p]referably, the digitized video information is stored
7 in a compressed form." Pocock, col. 4, ll. 39-40. When considered in light of the fact that "[t]he
8 presentation system 10 processes the incoming requests from the viewers and retrieves video
9 frames and accompanying audio associated with the presentations desired by the various
10 viewers," id. at col. 3, ll. 42-45, it is clear that compression of the stored video information
11 occurs prior to receipt of a request for the video information. The retrieved compressed video
12 frames can be transmitted in their compressed format to the user terminal, which will effect
13 decompression and display of the presentation. Id. at col. 19, ll. 43-61. Dr. Koopman is
14 therefore incorrect to deny that Pocock discloses compressing a response prior to receipt of a
15 query. 2d Koopman Decl. at 195-96, paras. 428-29.
16 Concerning the recited differential compression, the examiner notes that Pocock fails to
17 specify the type of compression performed and argues that “[Catros] expressly suggest[s] the
18 benefits of differential compression such as simplicity of application (col. 1) and the
19 improvement made [by Catros] as discussed in Col. 5, lines 2-22.” 3d Action at 103, para. 43;
20 Final Action at 257, para. 42. Catros discloses bit-rate compression of digital television signals.
21 Catros, col. 1, ll. 9-11. Figure 1 shows a prior-art differential coding system that employs
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