Inventor

Masaki Ichihara

Inventor

Tokyo, JP

Overview

1985–2015

Patent span

Electricity

Primary field (CPC H)

Patents· 64 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Bprimary

H04BTransmission18%

H04LTransmission of digital information, e.g. telegraphic communication13%

H03GControl of amplification10%

H03DDemodulation or transference of modulation from one carrier to another7%

H04WWireless communication networks7%

H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses5%

H03FAmplifiers4%

H04JMultiplex communication4%

G06FElectric digital data processing3%

H03CModulation3%

PatentTitleYear

8,995,565'Distortion control device and method'2015 8,620,274'Server, mobile communication system, and data updating method in the same'2013 8,396,176'OFDM receiving device and OFDM receiving method'2013 8,335,153'Orthogonal frequency division multiplex modem circuit'2012 8,050,367'Receiving amplitude correction circuit, receiving amplitude correction method, and receiver using the same'2011 7,856,216'Diversity receiver and gain adjusting method therefor'2010 7,843,803'Orthogonal frequency division multiplex modem circuit'2010 7,664,475'Multi-band wireless transceiver and method of controlling the same'2010 RE040553'Method and apparatus for adjusting transmission power of CDMA terminal'2008 7,330,729'Mobile terminal device and positional information system'2008 7,257,178'Base band circuit of receiver and low cut-off frequency control method'2007 7,228,117'Frequency correction method and apparatus for correcting secular change'2007 7,206,360'Amplitude deviation correction circuit'2007 7,127,224'Baseband circuit incorporated in direct conversion receiver free from direct-current offset voltage without change of cut-off frequency'2006 7,099,268'Orthogonal frequency division multiplex modem circuit'2006 7,069,060'Compound information terminal, mobile communications system and control method thereof'2006 7,006,814'Direct conversion receiver and transceiver'2006 6,922,451'Frequency shifting circuit and method'2005 6,915,120'Information terminal apparatus having a variable directional antenna and control method thereof'2005 6,782,061'AGC circuit'2004 6,591,089'Mobile station with transmission power control system'2003 6,587,005'PLL circuit having a variable output frequency'2003 6,587,513'Predistorter'2003 6,570,914'Amplitude calculation circuit'2003 6,553,018'Method and apparatus for adjusting transmission power of a CDMA terminal'2003 6,496,937'Password updating apparatus and recording medium used therefor'2002 6,480,063'Method and circuit for controlling baseband gain'2002 6,434,373'Transmission power control device capable of decreasing current consumption'2002 6,424,124'System for providing charge between communication devices'2002 6,373,880'Frequency modulation circuit'2002 6,330,455'Transmission power controller for use in mobile communication terminal equipment'2001 6,275,558'Circuit and method for arbitrarily shifting M-sequence'2001 6,275,699'Mobile communication terminal for rapid adjustment of a reference frequency to a target frequency'2001 6,249,560'PLL circuit and noise reduction means for PLL circuit'2001 6,229,840'Diversity circuit'2001 6,097,715'CDMA communication system'2000 6,097,713'CDMA multi-code transmitter employing baseband signal time offset'2000 5,926,748'Portable radio apparatus capable of keeping antenna away from user when calling'1999 5,905,966'Portable radio apparatus capable of keeping antenna away from user when calling'1999 5,878,087'Signal communication device operable in a CDMA mode and an FM mode'1999 5,847,542'Circuit for preventing overdischarge of rechargeable battery pack consisting of a plurality of rechargeable batteries'1998 5,841,320'Variable gain amplifying device'1998 5,809,019'Transmisson diversity system'1998 5,798,665'Bias controller for decreasing bias current supplied to amplifier without sacrifice if distortion'1998 5,784,412'Transmitter and method for transmitting a modulated wave with variable envelope'1998 5,705,912'Circuit for preventing overdischarge of rechargeable battery pack consisting of a plurality of rechargeable batteries'1998 5,640,413'Digital mobile radio communication system'1997 5,533,064'Digital radio receiver having limiter amplifiers and logarithmic detector'1996 5,521,559'Signal oscillator, FM modulation circuit using the same, and FM modulation method'1996 5,491,453'Narrow-band filter having a variable center frequency'1996 5,466,976'Time constant detecting circuit and time constant adjusting circuit'1995 5,455,384'High frequency module and method of producing the same'1995 5,410,195'Ripple-free phase detector using two sample-and-hold circuits'1995 5,355,101'Quadrature modulator having circuit for correcting phase error'1994 5,331,230'Integrated-circuit sampled-and-hold phase detector with integrated current setting resistor'1994 5,329,253'Frequency synthesis using frequency controlled carrier modulated with PLL feedback signal'1994 5,283,583'High-speed A/D conversion using a series of one-bit conversion stages'1994 5,255,288'Arrangement for converting binary input signal into corresponding in-phase and quadrature phase signals'1993 5,212,481'Circuit for code converting PCM codes'1993 5,196,806'Output level control circuit for use in RF power amplifier'1993 5,170,130'Phase lock loop circuit with a subsidiary loop filter'1992 5,157,344'Digital quadrature phase detector for angle modulated signals'1992 4,841,301'Device operable like an automatic level control circuit for decoding a multivalued signal'1989 4,509,199'Power supply systems for use in radio communication systems'1985

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1985Patents assigned to NIPPON ELECTRIC CO (1)· patent assignee history

1985–2015Based in Tokyo, JP· patent location history

1989–2013Patents assigned to NEC CORP (62)· patent assignee history

2003–2010Based in Minato-ku, JP· patent location history

2012–2015Patents assigned to ICHIHARA MASAKI (4)· patent assignee history

2012Patents assigned to FURUYA YUKITSUNA (1)· patent assignee history

2015Patents assigned to LENOVO INNOVATIONS LTD HONG KONG (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NEC CORP	62	1989–2013
ICHIHARA MASAKIself	4	2012–2015
FURUYA YUKITSUNA	1	2012
LENOVO INNOVATIONS LTD HONG KONG	1	2015
NIPPON ELECTRIC CO	1	1985

Locations

Location	Patents	Span
Tokyo, JP	62	1985–2015
Minato-ku, JP	2	2003–2010