Inventor · disambiguated record
Masao Kawachi
Also filed as: KAWACHI MASAO
22 granted patents·1,562 citations·filing 1974–1999
97Inventor score
Top patents by PatentIndex Score
22 records- 0197US4763977AOptical fiber coupler with tunable coupling ratio and method of makingCANADIAN PATENTS DEV·Filed 1985·Granted Aug 16, 1988·192 cites·11 claims
- 0297US4750799AHybrid optical integrated circuitNIPPON TELEGRAPH & TELEPHONE·Filed 1985·Granted Jun 14, 1988·202 cites·12 claims
- 0396US5546483AIntegrated optical waveguide circuit and optical branch line test system using the sameNIPPON TELEGRAPH & TELEPHONE·Filed 1994·Granted Aug 13, 1996·114 cites·19 claims
- 0496US4345928AFabrication method of single-mode optical fiber preformsNIPPON TELEGRAPH & TELEPHONE·Filed 1980·Granted Aug 24, 1982·63 cites·7 claims
- 0595US4735677AMethod for fabricating hybrid optical integrated circuitNIPPON TELEGRAPH & TELEPHONE·Filed 1987·Granted Apr 5, 1988·115 cites·15 claims
- 0693US4781424ASingle mode channel optical waveguide with a stress-induced birefringence control regionNIPPON TELEGRAPH & TELEPHONE·Filed 1987·Granted Nov 1, 1988·118 cites·32 claims
- 0791US5414548AArrayed-wave guide grating multi/demultiplexer with loop-back optical pathsNIPPON TELEGRAPH & TELEPHONE·Filed 1993·Granted May 9, 1995·151 cites·33 claims
- 0891US4367085AMethod of fabricating multi-mode optical fiber preformsNIPPON TELEGRAPH & TELEPHONE·Filed 1980·Granted Jan 4, 1983·45 cites·10 claims
- 0988US3936815AApparatus and method for writing storable images into a matrix-addressed image-storing liquid crystal display deviceNIPPON TELEGRAPH & TELEPHONE·Filed 1974·Granted Feb 3, 1976·46 cites·7 claims
- 1087US5044715AGuided-wave optical branching components and optical switchesNIPPON TELEGRAPH & TELEPHONE·Filed 1990·Granted Sep 3, 1991·80 cites·18 claims
- 1187US4978188AIntegrated optical device and method for manufacturing thereofNIPPON TELEGRAPH & TELEPHONE·Filed 1989·Granted Dec 18, 1990·52 cites·19 claims
- 1287US4900112AIntegrated optical device and method for manufacturing thereofNIPPON TELEGRAPH & TELEPHONE·Filed 1988·Granted Feb 13, 1990·52 cites·3 claims
- 1384US5165001AGuided-wave optical branching deviceNIPPON TELEGRAPH & TELEPHONE·Filed 1991·Granted Nov 17, 1992·70 cites·13 claims
- 1481US5572611AOptical signal processor, method of its control, method of its designing, and method of its productionNIPPON TELEGRAPH & TELEPHONE·Filed 1994·Granted Nov 5, 1996·54 cites·73 claims
- 1580US5117470AGuided-wave optical circuit and method for adjusting a characteristic thereofNIPPON TELEGRAPH & TELEPHONE·Filed 1991·Granted May 26, 1992·54 cites·27 claims
- 1676US5247594AWaveguide-type optical matrix switchNIPPON TELEGRAPH & TELEPHONE·Filed 1992·Granted Sep 21, 1993·46 cites·29 claims
- 1762US5204921AAutomated optical main distributing frame systemNIPPON TELEGRAPH & TELEPHONE·Filed 1992·Granted Apr 20, 1993·30 cites·15 claims
- 1862US4838916AMethod for making single-polorization, single mode optical fibersNIPPON TELEGRAPH & TELEPHONE·Filed 1987·Granted Jun 13, 1989·16 cites·18 claims
- 1961US4306767ASingle-mode optical fiberNIPPON TELEGRAPH & TELEPHONE·Filed 1979·Granted Dec 22, 1981·19 cites·2 claims
- 2054US5513285ACompact optical switching module including thin-film heaters and trimmed thick-film fixed resistorsOKI ELECTRIC IND CO LTD·Filed 1994·Granted Apr 30, 1996·22 cites·7 claims
- 2150US4406684ACore torch for fabricating single-mode optical fiber preformsNIPPON TELEGRAPH & TELEPHONE·Filed 1982·Granted Sep 27, 1983·10 cites·4 claims
- 2238US6643463B1Optical wavelength division multiplexing transmission network system using transmitting/receiving apparatuses having 2-input and 2-output optical path switching elementsNIPPON TELEGRAPH & TELEPHONE·Filed 1999·Granted Nov 4, 2003·11 cites·4 claims
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