Reexamination Control No. 90/005,742
Patent 5,253,341
1 Id. at col. 1, l. 67 to col. 2, l. 5. The first type of encoding employed by the system is to replace
2 at least some data units with library addresses:
3 [T]he most statistically recurrent portion of the total number of units are
4 stored in a memory library. Then the memory library is searched for each
5 word/unit and if the word/unit is found, the binary address of the
6 word/unit in the library memory is substituted for the binary data
7 representing the word/unit together with an appropriate code indicating
8 that the substitution has been made. The binary data stream is thus
9 compressed by compiling a data stream consisting alternatively of units in
10 the original form, or the addresses of such units in a library memory, with
11 an "escape code" designating which alternative is used. Decompression is
12 then achieved by detecting the address data and fetching the unit from the
13 same address of an identical library memory.
14
15 Id. at col. 2, ll. 43-57. This first encoding technique can be supplemented by applying Huffman
16 coding to the data units which are not found in the library memory. Id. at col. 3, ll. 28-32.46 The
17 library memory can be predetermined and fixed or can be complied in a reconfiguration library
18 as data are being transmitted. Id.at col. 3, ll. 40-43.
19 The examiner's position is that it would have been obvious to modify the compression
20 teaching of Filepp with that of Giltner "[f]or the benefit[s] expressly taught by Giltner et al.
21 (Col. 13, line 65 - col.14, line 67)." 3d Action at 85-86, para. 18; Final Action at 242-43,
22 para. 18. Some of these benefits are stated as follows:
23 Since the unit 14 can operate at a substantially greater speed than
24 data can be transmitted over most communications networks, a number of
25 options are available in the sequence of operation. For example, as soon
26 as a portion of a message is received from the local station and stored in
27 memory, the unit will attempt to establish contact with the designated
28 remote terminal. Compression of the message can then begin as soon as a
46 Dr. Koopman's testimony (2d Koopman Decl. at 80, para. 169) that Giltner fails to
disclose two compression modes is therefore not understood.
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