Von Roll, Inc.
62Patents
0Active
62Granted
39Portfolio score
Filing activity: Mar 8, 1974 → Jun 10, 1994
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3943334A | Heat weldable, thermoplastic fitting | Performing Operations; Transporting | 49 | Expired |
| US4530521A | Electrically weldable socket for joining pipe members | Performing Operations; Transporting | 46 | Expired |
| US4117311A | Electric welding muff | Performing Operations; Transporting | 42 | Expired |
| US4925337A | Manhole covering | Fixed Constructions | 27 | Expired |
| US4269232A | Protective cap for pipes | Performing Operations; Transporting | 26 | Expired |
| US4703150A | Weldable connecting member for connecting or joining thermoplastic pipe elements | Performing Operations; Transporting | 24 | Expired |
| US4707272A | Method for controlling and optimizing the operation of a perforated belt press for filtering slurry | Performing Operations; Transporting | 24 | Expired |
| US4873795A | Covering for a ground opening | Fixed Constructions | 23 | Expired |
| US4861186A | Covering for an opening with a cover or grating placed in a frame | Fixed Constructions | 22 | Expired |
| US5071177A | Locking device for the positive holding of a cover or grate in a frame | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4952094A | Ground water drain | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5045292A | Process for the removal of nitric oxides from flue gases | Performing Operations; Transporting | 20 | Expired |
| US4648633A | Socket joint | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US4315712A | Loading method and device for feeding waste-filled containers into a rotary incinerator | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4018168A | Incinerator feed | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4206905A | Gate valve | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4463688A | Grate block for a refuse incineration grate | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5056955A | Locking device for coverings for manholes and other ground openings | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4530520A | Electrically weldable bushings | Performing Operations; Transporting | 16 | Expired |
| US4909660A | Grating with a locking mechanism | Fixed Constructions | 15 | Expired |
| US4325396A | Apparatus for cleaning a filter press | Performing Operations; Transporting | 13 | Expired |
| US4056068A | Process for conditioning flue gases in waste material incineration plants with heat utilization | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US5246578A | Filter press and cleaning means therefor | Performing Operations; Transporting | 12 | Expired |
| US5160213A | Covering for a ground opening | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4276835A | method for processing sewage sludge | Emerging Cross-Sectional Technologies | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.