Inventor

John Y. Ma

Inventor

Milpitas, CA, US

Overview

30→

Patents

1976–2003

Patent span

Electricity

Primary field (CPC H)

Patents· 30 as inventor

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

H03Jprimary

H03JTuning resonant circuits30%

H04NPictorial communication, e.g. television11%

H01QAntennas, i.e. radio aerials9%

H03BGeneration of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner9%

H03DDemodulation or transference of modulation from one carrier to another9%

H04BTransmission9%

G01BMeasuring length, thickness or similar linear dimensions4%

H03HImpedance networks, e.g. resonant circuits4%

H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses4%

H05KPrinted circuits4%

PatentTitleYear

6,509,559'Binary optical grating and method for generating a moire pattern for 3D imaging'2003 6,501,554'3D scanner and method for measuring heights and angles of manufactured parts'2002 5,912,595'Digitally temperature compensated voltage-controlled oscillator tunable to different frequency channels'1999 5,159,711'Interference filter with high degree of selectivity for TVRO receiver system'1992 5,060,297'TVRO receiver system with tracking filter for rejection of image frequencies'1991 5,003,622'Printed circuit transformer'1991 4,876,739'TVRO receiver system with low-cost video-noise reduction filter'1989 4,816,769'BPSK demodulator and FM receiver for digital data pagers'1989 4,805,232'Ferrite-core antenna'1989 4,801,940'Satellite seeking system for earth-station antennas for TVRO systems'1989 4,792,993'TVRD receiver system with automatic bandwidth adjustment'1988 4,785,302'Automatic polarization control system for TVRO receivers'1988 4,783,848'TVRO receiver system for locating audio subcarriers'1988 4,761,825'TVRO earth station receiver for reducing interference and improving picture quality'1988 4,746,879'Digitally temperature compensated voltage-controlled oscillator'1988 4,718,117'TVRO receiver system with low-cost video-noise reduction filter'1988 4,709,409'TVRO receiver with surface mounted high frequency voltage-controlled oscillator'1987 4,684,858'Motor pulse extraction system'1987 4,626,862'Antenna having coaxial driven element with grounded center conductor'1986 4,625,183'Low-cost VCO using lumped elements in microwave band'1986 4,619,000'CATV converter having improved tuning circuits'1986 4,352,209'Up-down frequency converter for cable T.V.'1982 4,015,075'Television receiver automatic frequency control system'1977 4,002,986'Television receiver with tuner capable of receiving air and CATV signals'1977 3,983,490'Signal overload protection circuit for varactor tuner'1976 3,980,968'Non-proportionate AFC system'1976 3,965,427'Television tuning system with precision substrate switch assembly'1976 3,962,643'Abrupt junction varactor diode television tuner'1976 3,946,319'All electronic digital tuner system with memory'1976 3,931,579'Digital signal seeking tuning system'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1977Patents assigned to ZENITH RADIO CORP (8)· patent assignee history

1976–1982Based in Glenview, IL, US· patent location history

1982–1986Patents assigned to MA JOHN (3)· patent assignee history

1986–1989Patents assigned to CAPETRONIC BSR LTD (9)· patent assignee history

1986–1992Based in Milpitas, CA, US· patent location history

1987–1991Patents assigned to MA JOHN Y (5)· patent assignee history

1987Based in Miliptas, CA, US· patent location history

1991–1992Patents assigned to ASTEC INT LTD (2)· patent assignee history

1991–1999Based in Tai Po, HK· patent location history

2002–2003Based in Burnsville, MN, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CAPETRONIC BSR LTD	9	1986–1989
ZENITH RADIO CORP	8	1976–1977
MA JOHN Yself	5	1987–1991
MA JOHNself	3	1982–1986
ASTEC INT LTD	2	1991–1992

Locations

Location	Patents	Span
Milpitas, California, US	16	1986–1992
Glenview, Illinois, US	9	1976–1982
Burnsville, Minnesota, US	2	2002–2003
Tai Po, HK	2	1991–1999
Miliptas, California, US	1	1987