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Patentes

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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US394073810 Jul 197424 Feb 1976Electric lock
US395960712 Feb 197525 May 1976Christopher Anthony VargoCommunications booth with automatic accounting for telephone and booth usage
US402313924 Oct 197410 May 1977Security control and alarm system
US404433116 Jul 197323 Ago 1977International Business Machines CorporationData input apparatus having bidirectional reader for inputting alternative messages
US45380566 Feb 198527 Ago 1985Figgie International, Inc.Card reader for time and attendance
US454483222 Feb 19851 Oct 1985Figgie International, Inc.Card reader with buffer for degraded mode
US472195418 Dic 198526 Ene 1988Marlee Electronics CorporationKeypad security system
US476039327 Mar 198626 Jul 1988Marlee Electronics CorporationSecurity entry system
US48166583 Abr 198728 Mar 1989Casi-Rusco, Inc.Card reader for security system
US535932228 Sep 199225 Oct 1994Stanley Home AutomationMethod and apparatus for interconnected electronic locks
US541030124 Nov 199225 Abr 1995Mas-Hamilton GroupStatus monitoring system for an electronic lock
US592058131 May 19966 Jul 1999VTech Communications, Ltd.Error detection method and apparatus for digital communication data packets
US595637731 May 199621 Sep 1999VTech Communications, Ltd.Method and apparatus for synchronizing frames within a continuous stream of digital data
US59955543 Jun 199630 Nov 1999Vtech Communications, Ltd.Data framing format for digital radio communications and method of forming same
US621219918 Mar 19973 Abr 2001Apple Computer, Inc.Apparatus and method for interpretation and translation of serial digital audio transmission formats
US769348830 Sep 20046 Abr 2010VTech Telecommunications LimitedSystem and method for asymmetric enhanced mode operation in a digital communication system