Walther & Cie AG
10Patents
0Active
10Granted
32Portfolio score
Filing activity: Dec 11, 1974 → Mar 18, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4039304A | Method of removing SO.sub.2 and/or other acid components from waste gases | Performing Operations; Transporting | 56 | Expired |
| US4522634A | Method and apparatus for automatic regulation of the operation of an electrostatic filter | Performing Operations; Transporting | 30 | Expired |
| US3958643A | Sprinkler system and method of operating the same | Human Necessities | 18 | Expired |
| US4350224A | Rescue system on high rise buildings for evacuating persons in the case of fire | Performing Operations; Transporting | 14 | Expired |
| US4433752A | Rescue system on high-rise buildings | Human Necessities | 12 | Expired |
| US5387406A | Method and device for the adsorption and chemisorption, respectively, of gaseous components in a gas stream | Performing Operations; Transporting | 11 | Expired |
| US4854948A | Supply circuit for electrostatic dust separator | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4776864A | Electrostatic precipitator | Performing Operations; Transporting | 4 | Expired |
| US4226268A | Funnel | Performing Operations; Transporting | 4 | Expired |
| US4718575A | Apparatus for ascertaining the level of flowable material in dust separators and the like | Physics | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.