СПИСОК патентов США - подгруппа МПК16 H04M1/53


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№ п/п Номер патента Название патента

2013

18472613Intelligent and automatic calling process

2006

27079643Automatic determination of dialing methods for stored uniformly formatted phone numbers

2003

36519338Tone burst generator and its application to telephony

2000

46075850Flash-hook Caller ID

1999

55982855Automatic telephone answering apparatus
65930338Method for handling incoming calls on a pots telephone line to a user's premises

1998

75832075Off-hook detector for headset
85706341Active digit cancelling parallel dialer

1996

95539812Method and apparatus for detecting an attempted three-way conference call on a remote telephone
105490214Method and apparatus for selectively generating control signals in a telephone system

1994

115319702Method and apparatus for detecting and responding to hook flash events occurring on a remote telephone

1990

124975949Electronic headset telephone

1989

134887295Telephone instrument
144841568Circuit arrangement for a telephone station with earth connection to the central supply device
154817136Telephone dialing system
164809322Circuit arrangement for a telephone station with ground connection

1986

174614845Telephone hookswitch flasher
184614843Arrangement for opening the loop for a well-defined time interval from a telephone set
194613730Electronic telephone with feature access and speed dialing including loop breaks
204571462Multiple use digital tone generator in telephone

1985

214492823Dual timing circuit for telephone subscriber's instrument

1983

224419543Tone activated hold circuit
234387274Hook flash signal actuated telephone control device

1982

244313037Telephone station set with improved flash signalling

1981

254306119Telephone outpulsing circuit
264251693Fixed impulse generator for hook switch flash

1978

274086440Telephone set with loop current interruption timing control
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Дата формирования списка: 03.04.2017