Assignee
SUMMA FOUR INC
US·3 granted patents·350 citations·filing 1978–1994
Top patents by PatentIndex Score
3 records- 0193US4232199ASpecial services add-on for dial pulse activated telephone switching officeSUMMA FOUR INC·Filed 1978·Granted Nov 4, 1980·222 cites·41 claims
- 0279US5594727ATelephone switch providing dynamic allocation of time division multiplex resourcesSUMMA FOUR INC·Filed 1994·Granted Jan 14, 1997·105 cites·28 claims
- 0349US5426634AFlexible call-processing apparatus for ISDN telephone channelsSUMMA FOUR INC·Filed 1992·Granted Jun 20, 1995·23 cites·19 claims
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