Donlar Corporation
48Patents
0Active
48Granted
37Portfolio score
Filing activity: Feb 22, 1991 → Sep 9, 2002
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5219952A | Production of high molecular weight polysuccinimide and high molecular weight polyaspartic acid from maleic anhydride and ammonia | Chemistry; Metallurgy | 61 | Expired |
| US5152902A | Polyaspartic acid as a calcium carbonate and a calcium phosphate inhibitor | Chemistry; Metallurgy | 54 | Expired |
| US5221733A | Manufacture of polyaspartic acids | Chemistry; Metallurgy | 47 | Expired |
| US5296578A | Production of polysuccinimide and polyaspartic acid from maleic anhydride and ammonia | Chemistry; Metallurgy | 46 | Expired |
| US5116513A | Polyaspartic acid as a calcium sulfate and a barium sulfate inhibitor | Chemistry; Metallurgy | 45 | Expired |
| US5284512A | Polyaspartic acid and its salts for dispersing suspended solids | Emerging Cross-Sectional Technologies | 42 | Expired |
| US5593947A | Method for more efficient uptake of plant growth nutrients | Chemistry; Metallurgy | 35 | Expired |
| US5612384A | Superabsorbing polymeric networks | Chemistry; Metallurgy | 27 | Expired |
| US5350735A | Composition and method for enhanced fertilizer uptake by plants | Chemistry; Metallurgy | 24 | Expired |
| US5661103A | Seed treatment composition and method | Chemistry; Metallurgy | 24 | Expired |
| US5478919A | Aspartic acid copolymers and their preparation | Chemistry; Metallurgy | 22 | Expired |
| US5315010A | Polyaspartic acid manufacture | Chemistry; Metallurgy | 20 | Expired |
| US5508434A | Production of a polysuccinimide and derivatives thereof in the presence of a sulfur-containing dehydrating agent | Chemistry; Metallurgy | 18 | Expired |
| US5861356A | Method and composition for enhanced plant productivity comprising fertilizer and cross-linked polyamino acid | Chemistry; Metallurgy | 17 | Expired |
| US5580840A | Method and composition for preservation of cut flowers | Chemistry; Metallurgy | 16 | Expired |
| US6447717B1 | Composition and method for inhibition of metal corrosion | Chemistry; Metallurgy | 15 | Expired |
| US5373086A | Polyaspartic acid having more than 50% .beta. form and less that 50% .alpha. form | Chemistry; Metallurgy | 15 | Expired |
| US6277302A | Inhibition of metal corrosion | Chemistry; Metallurgy | 14 | Expired |
| US5552516A | Soluble, crosslinked polyaspartates | Chemistry; Metallurgy | 13 | Expired |
| US5373088A | Production of polyaspartic acid from maleic acid and ammonia | Chemistry; Metallurgy | 13 | Expired |
| US5814582A | Method for enhanced plant productivity | Chemistry; Metallurgy | 13 | Expired |
| US5935909A | Treatment of tree seedlings to enhance survival rate | Human Necessities | 12 | Expired |
| US5827512A | Method for the treatment of bronchial asthma and like hypersensitivity diseases by administration of anionic polymers | Human Necessities | 12 | Expired |
| US5854177A | Method for enhanced hydroponic plant productivity with polymeric acids | Chemistry; Metallurgy | 12 | Expired |
| US5607623A | Inhibition of carbon dioxide corrosion of metals | Emerging Cross-Sectional Technologies | 11 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.