Inventor

Yasuji Hattori

Inventor

Yokohama, JP

Overview

5→

Patents

1989–1997

Patent span

Physics

Primary field (CPC G)

Patents· 5 as inventor

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

G01Mprimary

G01MTesting static or dynamic balance of machines or structures27%

G02BOptical elements, systems or apparatus27%

H04BTransmission18%

G01BMeasuring length, thickness or similar linear dimensions9%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein9%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%

PatentTitleYear

5,671,308'Optical waveguide having diffraction grating area and method of fabricating the same'1997 5,506,674'Method for identifying an optical fiber using a pattern of reflected light'1996 5,381,261'Optical isolator'1995 5,265,179'Method of manufacturing fiber-optic collimators'1993 4,882,497'Method and apparatus of measuring outer diameter and structure of optical fiber'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1997Patents assigned to SUMITOMO ELECTRIC INDUSTRIES (5)· patent assignee history

1989Based in Kanagawa, JP· patent location history

1993–1997Based in Yokohama, JP· patent location history

1996–1997Patents assigned to NIPPON TELEGRAPH & TELEPHONE (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
SUMITOMO ELECTRIC INDUSTRIES	5	1989–1997
NIPPON TELEGRAPH & TELEPHONE	2	1996–1997

Locations

Location	Patents	Span
Yokohama, JP	4	1993–1997
Kanagawa, JP	1	1989