Pulp and Paper Research Institute of Canada
72Patents
0Active
72Granted
40Portfolio score
Filing activity: Nov 29, 1974 → Oct 24, 2003
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5629055A | Solidified liquid crystals of cellulose with optically variable properties | Emerging Cross-Sectional Technologies | 178 | Expired |
| US5838561A | Automatic control loop monitoring and diagnostics | Physics | 93 | Expired |
| US4510020A | Lumen-loaded paper pulp, its production and use | Textiles; Paper | 81 | Expired |
| US5311290A | Imaging apparatus and method of fiber analysis | Physics | 58 | Expired |
| US6235150A | Method for producing pulp and paper with calcium carbonate filler | Textiles; Paper | 47 | Expired |
| US5567293A | Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch | Textiles; Paper | 38 | Expired |
| US5616214A | Determination of sodium sulfide and sulfidity in green liquors and smelt solutions | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5082526A | Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5725737A | Apparatus for the detection of holes and plugged spots | Textiles; Paper | 31 | Expired |
| US4431479A | Process for improving and retaining pulp properties | Textiles; Paper | 30 | Expired |
| US5210958A | Paper web drying apparatus and process | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5976375A | Process for reducing production of biomass during activated sludge treatment of pulp and paper mill effluents | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4313790A | Additives for increased retention and pitch control in paper manufacture | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5232555A | Wet cellulosic web transfer method using air doctor blade | Textiles; Paper | 22 | Expired |
| US4008161A | Treatment of pulp mill effluents | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4248663A | Pulping with an alkaline liquor containing a cyclic keto compound and an amino compound | Textiles; Paper | 20 | Expired |
| US7074845B2 | Swollen starch-latex compositions for use in papermaking | Textiles; Paper | 19 | Expired |
| US5061343A | Recovery of NaOH and other values from spent liquors and bleach plant effluents | Textiles; Paper | 19 | Expired |
| US5006211A | Electrodialylic water splitting process for the treatment of aqueous electrolytes | Textiles; Paper | 19 | Expired |
| US6455661B1 | Papermaking additives and mechanical pulp with primary amino groups | Textiles; Paper | 17 | Expired |
| US5522958A | Two-stage kraft cooking | Textiles; Paper | 17 | Expired |
| US5451456A | Latex of poly-.beta.-hydroxyalkanoates for treating fiber constructs and coating paper | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5691193A | Non-chlorine bleaching of kraft pulp | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4788779A | Method and apparatus for the rapid consolidation and/or drying of moist porous webs | Textiles; Paper | 16 | Expired |
| US5127168A | Method for manufacture of smooth and glossy papers and apparatus | Textiles; Paper | 15 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.