Reexamination Control No. 90/005,742
Patent 5,253,341
1 suitable answerback is received. The message can then be simultaneously
2 received from a local terminal, compressed, and transmitted to the remote
3 terminal. This permits the use of smaller buffers 42 and 44 to handle
4 messages of indefinite length. A similar approach can be used for
5 receiving messages from remote terminals, decompressing the messages,
6 and forwarding them to the local terminal.
7 From the above detailed description of a preferred embodiment of
8 the invention, it will be appreciated by those skilled in the art that a unique
9 and novel text compression system has been described. The text
10 compression system may be advantageously used as an in-line addition for
11 existing relatively slow speed data handling systems, particularly
12 telecommunications systems. While the text compression system is
13 particularly useful for English and other language text, it also has
14 application in its broader aspects of compression to other data compiled in
15 a similar format.
16
17 Giltner, col. 13, l. 66 to col. 14, l. 24.
18 Dr. Koopman, after correctly characterizing Giltner as disclosing "a hybrid compression
19 scheme that uses two related but slightly different mechanisms intermingled in a stream of
20 compressed data," 2d Koopman Decl. at 84, para. 177, denies that this is sufficient to satisfy the
21 claim:
22 The examiner repeatedly argues that any compressed data stream with
23 more than one possible sub-algorithm comprises “two compression
24 techniques.” But, those are mere combinations of mechanisms, in contrast
25 to the word “techniques,” which implies that the techniques are being
26 distinctly applied. The difference is clear and compelling, as well as fully
27 supported by the claim wording.
28
29 Id. Dr. Koopman appears to be construing the claim language as requiring the simultaneous
30 application of plural encoding techniques to the same data units. We agree with the examiner
31 that the claim language is broad enough to read on successively applying different techniques to
32 different data units, as in Giltner.
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