Inventor

Tadashi Ishikawa

Inventor

Tokyo, JP

Overview

1980–2019

Patent span

Physics

Primary field (CPC G)

Patents· 73 as inventor

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

G03Gprimary

G03GElectrography9%

B23KSoldering or unsoldering8%

Y10TTechnical subjects covered by former us classification7%

H04NPictorial communication, e.g. television6%

G06FElectric digital data processing6%

H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems6%

C21DModifying the physical structure of ferrous metals4%

C22CAlloys4%

G04CElectromechanical clocks or watches4%

Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution4%

PatentTitleYear

10,500,817Electron-beam welded joint, steel for electron-beam welding, and method of manufacturing the same2019 9,991,482Magnesium-air fuel cell2018 9,871,277'Magnesium-air fuel cell and power supply device using the same'2018 9,716,280'Magnesium-air fuel cell'2017 9,352,424'Butt welding joint using high-energy density beam'2016 8,992,109'Butt-welded joint of welded structure, and method for manufacturing the same'2015 8,946,501'Liquid leakage detection system'2015 8,653,403'Butt-welded joint and method for manufacturing same'2014 8,623,154'Electron-beam welded joint, steel for electron-beam welding, and manufacturing method'2014 8,280,296'Powder transporting device and image forming apparatus'2012 8,114,528'Electron beam welded joint excellent in brittle fracture resistance'2012 7,920,816'Developer collection device and image forming apparatus'2011 7,857,918'Method of production of steel product with nanocrystallized surface layer'2010 7,829,202'Large-heat-input butt welded joints having excellent brittle fracture resistance'2010 7,754,033'Method of improvement of toughness of heat affected zone at welded joint of steel plate'2010 7,748,596'Welded structure having excellent resistance to brittle crack propagation and welding method therefor'2010 7,735,129'Firewall device'2010 7,695,825'Circularly welded joint featuring excellent fatigue strength, method of producing circularly welded joint and welded structure'2010 7,574,157'Image formation device with auxiliary roller'2009 7,399,371'Treatment method for improving fatigue life and long-life metal material treated by using same treatment'2008 6,934,497'Image forming apparatus with belt, plural sensitized bodies, and belt positioning mechanism'2005 6,090,226'Steel plate excellent in brittle crack propagation arrest characteristics and low temperature toughness and process for producing same'2000 6,038,631'Data processing system and method using virtual storage system'2000 6,027,260'Camera shutter and driving device having piezoelectric element for use therewith'2000 5,787,303'Digital computer system capable of processing a plurality of instructions in parallel based on a VLIW architecture'1998 5,748,460'Power supply apparatus'1998 5,636,009'Image forming apparatus having charging member'1997 5,627,434'Apparatus for operating a fluorescent lamp of an image forming apparatus'1997 5,619,403'Multi-output power supply apparatus'1997 5,612,857'Power supply apparatus'1997 5,552,857'Multicolor image forming apparatus'1996 5,414,862'Apparatus for controlling a power source'1995 5,392,339'Telephone transfer apparatus using a special signal for transfer in facsimile communication'1995 5,375,220'Multiprocessor system including a cache memory with tag copy units'1994 5,289,532'Facsimile apparatus providing facsimile transmission with forwardable voice communication'1994 5,285,368'Power source device responsive to supplemental plural output voltages'1994 5,283,891'Error information saving apparatus of computer'1994 5,175,577'Drive member sensing arrangement for an automatic focusing system of a camera'1992 5,113,501'System for checking the activity and activity ratio of microprogram under test'1992 5,063,530'Method of adding/subtracting floating-point representation data and apparatus for the same'1991 5,019,840'Recording apparatus with improved sheet feeding'1991 4,945,255'Power source device'1990 4,939,580'Picture reading apparatus'1990 4,929,977'Flash photography changeover device'1990 D0308222'Document recorder'1990 4,888,618'Image forming apparatus having ambient condition detecting means'1989 4,846,115'Air-cooled engine'1989 4,838,534'Paper feed apparatus'1989 4,831,455'Picture reading apparatus'1989 4,825,295'Image reading apparatus'1989 4,793,301'Lubricating system for an internal combustion engine'1988 4,772,899'Scanning mechanism for recording apparatus'1988 4,755,835'Time recorder with printing wheels and impression hammer'1988 4,751,521'Time recorder with automatic correction for momentary discontinuation of power supply'1988 4,731,668'Image reading apparatus including means for accurately determining the location of read image information'1988 4,709,915'Sorting apparatus'1987 4,709,319'Power supply device'1987 4,707,799'Bit sliced decimal adding/subtracting unit for multi-digit decimal addition and subtraction'1987 4,698,650'Recording apparatus and cassette for recording medium'1987 4,657,404'Alarm signaling time indicating mechanism for an alarm clock'1987 4,607,320'Power supply device having a switched primary power supply and control means for maintaining a constant off period and a variable on period'1986 4,600,294'Image forming apparatus with detector and control'1986 4,485,098'Method for promoting healing of wound and lowering blood level of creatine phosphokinase'1984 4,444,511'Mode switching device in an electronic timepiece'1984 4,423,966'Alarm control system for alarm clock'1984 4,410,541'Composite for improving lipid metabolism'1983 4,400,091'Second stop device of clock'1983 4,394,376'Method for preventing hypertriglyceridemia'1983 4,376,994'Time detecting device for alarm clock'1983 4,371,267'Time detecting device for alarm clock'1983 4,338,304'Composite for treating diabetes'1982 4,197,436'Timer mechanism'1980 4,187,294'Method for producing eggs containing a high amount of iodinated amino acids'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–1984Based in Sagamihara, JP· patent location history

1984–2000Based in Yotsukaido, JP· patent location history

1986–1998Patents assigned to CANON KK (22)· patent assignee history

1986–2019Based in Tokyo, JP· patent location history

1987–2000Patents assigned to TOSHIBA KK (7)· patent assignee history

1987–1991Based in Urawa, JP· patent location history

1994–2012Patents assigned to FUJI XEROX CO LTD (7)· patent assignee history

2000–2019Patents assigned to NIPPON STEEL CORP (9)· patent assignee history

2008–2012Based in Futtsu, JP· patent location history

2012–2019Patents assigned to ISHIKAWA TADASHI (8)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CANON KK	22	1986–1998
NIPPON STEEL CORP	9	2000–2019
ISHIKAWA TADASHIself	8	2012–2019
FUJI XEROX CO LTD	7	1994–2012
TOSHIBA KK	7	1987–2000

Locations

Location	Patents	Span
Tokyo, JP	29	1986–2019
Urawa, JP	10	1987–1991
Futtsu, JP	7	2008–2012
Yotsukaido, JP	5	1984–2000
Sagamihara, JP	5	1980–1984