US Patent No: 6,743,946
Number of patents in Portfolio can not be more than 2000
Method for separating hydroxymethylthiobutyric acid
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Jun 1, 2004
Issued date -
Jan 8, 2001
filing date -
09/743,288
serial no -
In Force
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Abstract
The invention concerns an improved method for separating hydroxymethylthiobutyric acid by neutralising hydroxymethylthiobutyronitrile sulphuric hydrolysate, decanting and treating each phase with an organic solvent.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,353,924 Animal feed supplement having reduced corrosion characteristics | 5 | 1979 | |
| 4,310,690 Preparation of the calcium salt of .alpha.-hydroxy-gamma-methylmercaptobutyric acid | 14 | 1980 | |
| 4,524,077 Liquid 2-hydroxy-4-methylthiobutyric acid and process for the preparation thereof | 23 | 1983 | |
| 4,579,962 Enhanced 2-hydroxy-4-methylthiobutanoic acid compositions and method of preparation | 8 | 1984 | |
| 5,498,790 Regeneration of sulfuric acid from sulfate by-products of 2-hydroxy-4-(methylthio)butyric acid manufacture | 7 | 1993 | |
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| 5,386,056 Process for producing 2-hydroxy-4-methylthiobutanoic acid | 6 | 1994 | |
| 5,763,652 Process for producing a carboxylic acid | 8 | 1996 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 1, 2015 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |