Patent assignee · JP · COMPANY

Techno Ryowa Ltd.

5Patents
1Active
5Granted
30Portfolio score

Filing activity: Mar 21, 1991 → Aug 22, 2006 · 1 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US5847917A Air ionizing apparatus and method Electricity 40 Expired
US5296018A Method and apparatus for eliminating electric charges in a clean room Electricity 23 Expired
US5249094A Pulsed-DC ionizer Electricity 20 Expired
US7397647B2 Ionized gas current emission type dust-free ionizer Electricity 5 Active
US7126807B2 Ionized air flow discharge type non-dusting ionizer Electricity 4 Expired

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.