Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 8278383 | Methods of preparing polymer-organoclay composites and articles derived therefrom A method for preparing a polymer-organoclay composite composition comprises combining a solvent and an unexfoliated organoclay to provide a first mixture, wherein the unexfoliated organoclay comprises alternating inorganic silicate layers and organic layers, and has... | 10/02/2012 |
| 8158243 | Methods of preparing polymer-organoclay composites and articles derived therefrom A method for preparing a polymer-organoclay composite composition comprises combining a solvent and an unexfoliated organoclay to provide a first mixture, wherein the unexfoliated organoclay comprises alternating inorganic silicate layers and organic layers, and has... | 04/17/2012 |
| 8080671 | Production of low color polyetherimides The production of low color polyetherimides, including its intermediates, such as bisimides and diaryl diether dianhydrides, may be affected by producing an improved purity intermediate of 4-nitro-N-alkylphthalimide. A salt, such as alkali metal carbonate or alkali ... | 12/20/2011 |
| 7928155 | Compositions and methods for polymer composites In one embodiment, the present invention provides a method of making a polymer-organoclay composite composition comprising (a) contacting under condensation polymerization conditions a first monomer, a second monomer, a solvent, and an organoclay composition, said o... | 04/19/2011 |
| 7928154 | Methods of preparing polymer-organoclay composites and articles derived therefrom A method for preparing a polymer-organoclay composite composition comprises combining a solvent and an unexfoliated organoclay to provide a first mixture, wherein the unexfoliated organoclay comprises alternating inorganic silicate layers and organic layers, and has... | 04/19/2011 |
| 7041773 | Polyimide sulfones, method and articles made therefrom Polyimide sulfone resins are provided with a glass transition temperature of from 200–350° C., residual volatile species concentration of less than 500 ppm and a total reactive end group concentration of less than about 120 milliequivalents/kilogram resin. The re... | 05/09/2006 |
| 6919422 | Polyimide resin with reduced mold deposit A polyimide composition and a process to prepare polyimide resins with reduced plate out and mold deposits is described. During resin molding operations the low plate out resins show a longer period of operation between cleaning of equipment leading to more efficien... | 07/19/2005 |
| 6881815 | Method for the preparation poly(etherimide)s A method for the synthesis of poly(etherimide)s comprises the reaction of 4-halotetrahydrophthalic anhydride with an activating primary amine to yield an activated 4-halotetrahydrophthalimide. Activated 4-halotetrahydrophthalimide may then be aromatized and treated ... | 04/19/2005 |
| 6590108 | Methods for the preparation of dianhydrides A method for the synthesis of a dianhydride comprises transimidation of bis (imide) (IV) ##STR1## in the presence of a substituted phthalic anhydride or 4-substituted tetrahydrophthalic anhydride to yield dianhydride (V) ##STR2##... | 07/08/2003 |
| 6576770 | Preparation of substituted phthalic anhydrides and substituted phthalimides A process for the formation of halophthalic anhydrides and halogen substituted-n-alkyl-phthalimides from the corresponding substituted-n-alkyl-tetrahydrophthalimide by passing said substituted-n-alkyl-tetrahydrophthalimide over a metal catalyst, in the ... | 06/10/2003 |
| 6528663 | Methods for the preparation of 4-chlorophthalic anhydride A method for the synthesis of substituted phthalic anhydrides (IV) ##STR1## wherein R' is a halogen, aromatic or aliphatic group comprising 1-18 carbons, hydrogen or nitro group is the transimidation between a substituted N-alkyl phthalimide (V) ##ST... | 03/04/2003 |
| 6498224 | Methods for the preparation poly(etherimide)s A new method for the synthesis of poly(etherimide)s comprises transimidation of bis(imide) (IV) ##STR1## in the presence of a substituted phthalic anhydride or 4-substituted tetrahydrophthalic anhydride to yield dianhydride (V) ##STR2## which may the... | 12/24/2002 |
| 6251354 | Process for recovering sodium nitrite The present invention provides a process for recovering a metal nitrite, e.g., sodium nitrite, from a reaction mixture formed from an aromatic displacement reaction such as the synthesis of an aromatic bis(ether phthalimide) in an organic non-polar solven... | 06/26/2001 |
| 6235934 | Aqueous hexasubstituted guanidinium chlorides and methods for their preparation and use Hexasubstituted guanidinium chlorides are prepared by a method which affords them in high yield as aqueous solutions, optionally also containing alkali metal chlorides. The solutions may be employed as sources of hexasubstituted guanidinium salts useful a... | 05/22/2001 |
| 6008374 | Process for preparing bis (ether anhydrides) using alkylamine derived bisimides having low melting temperatures A process for making bis(ether anhydrides) employs alkylamines having low melting temperatures thus allowing for novel intermediate process steps for preparing bis(ether anhydrides). The alkylamines have alkyl groups which contain at least three carbon at... | 12/28/1999 |
| 5936099 | Process for preparing BIS(ether anhydrides) using alkylamine derived bisimides having low melting temperature A process for making bis(ether anhydrides) employs alkylamines having low melting temperatures thus allowing for novel intermediate process steps for preparing bis(ether anhydrides). The alkylamines have alkyl groups which contain at least three carbon at... | 08/10/1999 |
| 5872294 | Aqueous hexasubstituted guanidinium chlorides and methods for their preparation and use Hexasubstituted guanidinium chlorides are prepared by a method which affords them in high yield as aqueous solutions, optionally also containing alkali metal chlorides. The solutions may be employed as sources of hexasubstituted guanidinium salts useful a... | 02/16/1999 |
| 5719295 | Process for preparing bis(ether anhydrides) using alkylamine derived bisimides having low melting temperatures A process for making bis(ether anhydrides) employs alkylamines having low melting temperatures thus allowing for novel intermediate process steps for preparing bis(ether anhydrides). The alkylamines have alkyl groups which contain at least three carbon at... | 02/17/1998 |
