Keller Holding GmbH
🏢 View company profile →29Patents
10Active
29Granted
42Portfolio score
Filing activity: Apr 25, 1975 → Jul 16, 2021 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4018293A | Method and apparatus for controlled fracturing of subterranean formations | Mechanical Engineering; Lighting; Heating | 38 | Expired |
| US4030893A | Method of preparing low-sulfur, low-ash fuel | Chemistry; Metallurgy | 35 | Expired |
| US4045092A | Fuel composition and method of manufacture | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4192651A | Method of producing pulverulent carbonaceous fuel | Performing Operations; Transporting | 17 | Expired |
| US3968999A | Method of making available fuels from arctic environments | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6580563B1 | Image detection system | Physics | 13 | Expired |
| US4146366A | Method of removing gangue materials from coal | Performing Operations; Transporting | 13 | Expired |
| US4313386A | System for transport of mixtures of solid particulate fuel and air, and rotary distributor suitable for use therein | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4089657A | Stabilized suspension of carbon in hydrocarbon fuel and method of preparation | Chemistry; Metallurgy | 11 | Expired |
| US4161368A | Brick blending apparatus | Performing Operations; Transporting | 10 | Expired |
| US4338917A | Low temperature solar furnace and method | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7618608B1 | Aerogel and method of manufacturing same | Performing Operations; Transporting | 7 | Active |
| US8217087B1 | Aerogel with reduced dust, static charge, and having reduced fluidity when in granular form | Chemistry; Metallurgy | 6 | Active |
| US5045087A | Stabilized suspensions of carbon or carbonaceous fuel particles in water | Chemistry; Metallurgy | 6 | Expired |
| US6719498B2 | Slope stabilizer | Fixed Constructions | 6 | Expired |
| US4097217A | Method for converting combustor from hydrocarbonaceous fuel to carbonaceous fuel | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4353353A | Low temperature solar furnace and method | Emerging Cross-Sectional Technologies | 4 | Expired |
| US5730556A | Removable ground anchor | Fixed Constructions | 3 | Expired |
| US4604255A | Method for fabricating molded bodies formed at least partially of swelled clay material and apparatus for the performance of the method | Chemistry; Metallurgy | 2 | Expired |
| US9657524B2 | Drilling apparatus | Fixed Constructions | 2 | Active |
| US4443974A | Door having a frame comprising sections glued to each other | Fixed Constructions | 1 | Expired |
| US11774438B2 | Measurement set-up for a return cement suspension, construction site arrangement having a measurement set-up as well as method and use | Physics | 0 | Active |
| US4493805A | Method and oven for manufacturing a light construction element, particularly a cover plate | Fixed Constructions | 0 | Expired |
| US10508401B2 | Depth vibrator with adjustable imbalance | Performing Operations; Transporting | 0 | Active |
| US10053831B2 | Process and assembly for determining the radius of a ground element which can be produced by jet grouting | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.