Inventor · disambiguated record
Tetsu Koyama
Also filed as: KOYAMA TETSU
34 granted patents·380 citations·filing 1975–2020
97Inventor score
Top patents by PatentIndex Score
34 records- 0194US7187876B2Image forming apparatus with mechanism to control toner replenishmentOKI DATA KK·Filed 2004·Granted Mar 6, 2007·52 cites·19 claims
- 0292US9448530B1Developer storage body, image forming unit and image forming apparatusOKI DATA KK·Filed 2015·Granted Sep 20, 2016·5 cites·20 claims
- 0386US7522851B2Developing deviceOKI DATA KK·Filed 2005·Granted Apr 21, 2009·9 cites·16 claims
- 0483US7400837B2Image recording apparatusOKI DATA KK·Filed 2005·Granted Jul 15, 2008·7 cites·15 claims
- 0583US5388092AEcho canceller for two-wire full duplex digital data transmissionNEC CORP·Filed 1993·Granted Feb 7, 1995·103 cites·3 claims
- 0680US7313356B2Image forming apparatusOKI DATA KK·Filed 2005·Granted Dec 25, 2007·6 cites·10 claims
- 0778US8712294B2Image forming unit having agitating portion and image forming apparatusKOYAMA TETSU·Filed 2011·Granted Apr 29, 2014·3 cites·10 claims
- 0876US10466619B2Replaceable unit, developing unit, image forming unit, and image forming apparatusOKI DATA KK·Filed 2018·Granted Nov 5, 2019·1 cites·14 claims
- 0976US6934490B2Toner container, print process cartridge and image forming apparatusOKI DATA KK·Filed 2003·Granted Aug 23, 2005·15 cites·12 claims
- 1075US6859508B1Four dimensional equalizer and far-end cross talk canceler in Gigabit Ethernet signalsNEC ELECTRONICS AMERICA INC·Filed 2000·Granted Feb 22, 2005·23 cites·10 claims
- 1175US5353279AEcho cancelerNEC CORP·Filed 1992·Granted Oct 4, 1994·54 cites·3 claims
- 1272US9152125B2Image forming unit and image forming apparatus that incorporates the image forming unitOKI DATA KK·Filed 2014·Granted Oct 6, 2015·1 cites·20 claims
- 1371US8983342B2Developer storage container, image forming unit and image forming apparatusOKI DATA KK·Filed 2012·Granted Mar 17, 2015·1 cites·18 claims
- 1470US6560430B2Developing unit having an opening allowing toner to fall directly onto a developing member and supplying member contact areaOKI DATA KK·Filed 2001·Granted May 6, 2003·13 cites·18 claims
- 1564USD546873SToner cartridgeOKI DATA KK·Filed 2005·Granted Jul 17, 2007·14 cites·1 claims
- 1663US7437105B2Developing device and image forming apparatusOKI DATA KK·Filed 2006·Granted Oct 14, 2008·2 cites·10 claims
- 1761USD491602SToner cartridgeOKI DATA KK·Filed 2003·Granted Jun 15, 2004·11 cites·1 claims
- 1860US7957682B2Image forming unit and image forming apparatusOKI DATA KK·Filed 2008·Granted Jun 7, 2011·1 cites·19 claims
- 1956USD967891SToner cartridgeOKI DATA KK·Filed 2020·Granted Oct 25, 2022·2 cites·1 claims
- 2056US4984250ADC termination circuit for subscriber cablesNEC CORP·Filed 1989·Granted Jan 8, 1991·19 cites·6 claims
- 2153US10606208B2Developer container, image formation unit, and image formation apparatusOKI DATA KK·Filed 2018·Granted Mar 31, 2020·0 cites·21 claims
- 2252USD529076SImage drum cartridgeOKI DATA KK·Filed 2005·Granted Sep 26, 2006·8 cites·1 claims
- 2351USD501020SImage drum cartridgeOKI DATA KK·Filed 2003·Granted Jan 18, 2005·7 cites·1 claims
- 2449US9223249B2Image forming unit and image forming apparatusOKI DATA KK·Filed 2014·Granted Dec 29, 2015·0 cites·20 claims
- 2549US6711371B2Developing device having means to remove developer from a developer supplying memberOKI DATA KK·Filed 2002·Granted Mar 23, 2004·4 cites·10 claims
- 2646USD998033SImage drum cartridgeOKI ELECTRIC IND CO LTD·Filed 2020·Granted Sep 5, 2023·1 cites·1 claims
- 2746USD984529SImage drum cartridgeOKI ELECTRIC IND CO LTD·Filed 2020·Granted Apr 25, 2023·1 cites·1 claims
- 2846US10274866B2Toner container, image forming unit including the toner container, and image forming apparatus including the toner containerOKI DATA KK·Filed 2017·Granted Apr 30, 2019·0 cites·15 claims
- 2945US7917059B2Developing device and image forming apparatusOKI DATA KK·Filed 2008·Granted Mar 29, 2011·0 cites·11 claims
- 3044US9217952B2Image forming unit and image forming apparatusOKI DATA KK·Filed 2013·Granted Dec 22, 2015·0 cites·25 claims
- 3142US4700364AFSK with continuous phase and continuous slope at bit transitionsNEC CORP·Filed 1985·Granted Oct 13, 1987·11 cites·4 claims
- 3235USD1009988SToner cartridgeOKI ELECTRIC IND CO LTD·Filed 2020·Granted Jan 2, 2024·0 cites·1 claims
- 3333US3978433AMagnetic transmission devices using the edge-guided mode of propagationNAITO YOSHUKI·Filed 1975·Granted Aug 31, 1976·3 cites·10 claims
- 3431US5249179AEcho canceller system suitable for a 2B1Q transmission codeNEC CORP·Filed 1990·Granted Sep 28, 1993·3 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →