Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6903239 | Fluorinated benzaldehydes The present invention relates to fluorinated benzaldehydes, to a process for preparing them and also to the use of the fluorinated benzaldehydes for preparing active ingredients, especially in medicaments and agrochemicals. ... | 06/07/2005 |
| 6806395 | Process for preparation of 3,5-bisalkylphenols A process for producing a 3,5-bisalkylphenol (2) according to the following reaction scheme: (wherein R1 represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, or a hydroxyl-protecti... | 10/19/2004 |
| 5475156 | Method for making a 2,6-dialkylphenol A method is provided for converting a 2,4,6-trialkylphenol, such as mesitol, to a dialkylphenol, for example 2,6-dimethylphenol, by effecting the selective oxidation of the 2,4,6-trialkylphenol, followed by the deformylation of the resulting 3, 5-dialkyl-... | 12/12/1995 |
| 5243116 | Alkylation of aromatic compounds Alkylated benzenes such as ethylbenzene and cumene are produced by alkylation and/or transalkylation in the presence of an acidic mordenite zeolite catalyst having a silica/alumina molar ratio of at least 30:1 and a crystalline structure which is determin... | 09/07/1993 |
| 5198591 | Method to manufacture bisphenol A The invention relates to a process for obtaining a high purity bisphenol from a post-reaction mixture resulting from the step of synthesis of phenol and acetone in the presence of a strong acid cation exhanger catalyst, by the way of crystallation and sep... | 03/30/1993 |
| 5160497 | Phenol production process Phenol production process wherein: 1) benzene is reacted with propene and isopropylic alcohol by contacting a catalyst based on a dealuminized Y zeolite with a SiO2 /Al2 O3 molar ratio ranging from 8 to 70, then the obtained pr... | 11/03/1992 |
| 5082979 | Cymenol preparation by direct dehydrogenation The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by treating the 8-hydroxymenthenes in the vapor phase with a dehydrogenation catalyst, e.g. palladium. The process is preferably carried out at 80°-150° C.... | 01/21/1992 |
| 5068466 | Cymenol preparation by transfer dehydrogenation The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by reacting the 8-hydroxymenthenes in the liquid phase in the presence of a dehydrogenation catalyst, e.g. palladium and a hydrogen acceptor e.g. mesityl oxi... | 11/26/1991 |
| 4873376 | Process for the production of monomeric alkenylphenols from dihydroxydiphenylalkanes The invention relates to a process for the production of monomeric alkenylphenols from dihydroxydiphenylalkanes by thermal cleavage in certain solvents.... | 10/10/1989 |
| 4633022 | Process for preparation of trisubstituted phenols 2,6-dialkyl substituted phenols such as 2,6-ditertiary butylphenol are reacted with formaldehyde in methyl alcohol in the presence of an inert gas and a tertiary amine catalyst to produce a bis(3,5-di-t-butyl-4-hydroxybenzyl)ether; and the bis ether subje... | 12/30/1986 |
| 4584417 | Method for preparing p-alkylphenols from p-hydroxyalkylphenols p-Alkylphenols such as p-cresol are prepared by the reaction of p-hydroxyalkylphenols with water and oxygen in the presence of at least one oxide of a Group II metal having an atomic weight less than 70, preferably zinc oxide. At least part of the p-hydro... | 04/22/1986 |
| 4538002 | Process for the production of hydroxyanisole and alkylated hydroxyanisoles There is disclosed a process for the production of alkylated hydroxyanisoles which consists of dehydrogenating para-isopropylphenol to para-isopropenylphenol which is then reacted with a methylating agent to yield para-isopropenylanisole which is then tre... | 08/27/1985 |
| 4503271 | Process for the production of para-vinyl phenol by dehydrogenation of para-ethyl phenol A process for the production of p-vinyl phenol by the dehydrogenation of p-ethyl phenol in a gaseous phase in the presence of a catalyst and a diluent wherein the dehydrogenation of p-ethyl phenol is effected with phenol and/or p-cresol being present in t... | 03/05/1985 |
| 4480140 | Process for alkylating phenolic compounds to produce ortho or para-monoalkylated or 2,4- or 2,6-dialkylated phenols Phenols alkylated in the ortho and/or para positions are produced in good yields and in the absence of isomers from phenolic compounds having at least two alkylateable ortho-ortho or ortho-para positions open. The phenolic compound is first partially chlo... | 10/30/1984 |
| 4419529 | Process for the preparation of a 2-alkylphenol A 2-alkylphenol is prepared by reduction of a 2-acylphenol in the presence of a metallic catalyst. The reaction is carried out at a temperature of 80° to 200° C. and under a pressure of 10 to 100 bars, and a base metal, in particular copper, is used as ... | 12/06/1983 |
| 4346249 | Preparation of para-isopropenylphenol Para-isopropenylphenol can be obtained by dehydrogenation of para-isopropylphenol in the presence of a calcium-nickel phosphate catalyst, phenol, and water.... | 08/24/1982 |
| 3989741 | Preparation of antioxidants This invention comprises an alkylation, reduction and transesterification process for the preparation of ester substituted phenols. The products are useful as antioxidants and may be prepared in high yields and with a high degree of purity.... | 11/02/1976 |
| 3957897 | Method of oxydehydrogenation of alkyl aromatic compounds Certain alkaline earth pyrophosphates, such as Ca, Mg, and Sr pyrophosphates are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C2 -C6 alkyl side chain to f... | 05/18/1976 |
