Hair cream rinse formulations containing quaternary ammonium salts
Patent 3959461 Issued on May 25, 1976. Estimated Expiration Date: 
May 25, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 25, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2928772 3069320 3272712 3423504 InventorsApplicationNo. 473477 filed on 05/28/1974US Classes:424/70.28, Quaternary ammonium salts514/785, Carboxylic acid ester554/104, Plural nitrogens containing (e.g., guanidine, hydrazine, etc.)554/52Quaternary ammonium containingExaminersPrimary: Rosen, SamAssistant: Clarke, Vera C. Attorney, Agent or FirmAbstractNew quaternary ammonium salts have been prepared from an amino amide and an amino ester and found to be useful in hair cream rinse formulations. |
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