| Patent Number |
Title Of Patent |
Date Issued |
| 7299733 |
Bullet with spherical nose portion |
November 27, 2007 |
| A bullet includes a frontward facing aperture. Contained within the aperture is a relatively hard bullet frontal element that provides advantageous bullet impact performance. In one embodiment, the frontal element is a steel sphere that provides advantageous penetration and weight re |
| 6964232 |
Bullet with spherical nose portion |
November 15, 2005 |
| A bullet includes a frontward facing aperture. Contained within the aperture is a relatively hard bullet frontal element that provides advantageous bullet impact performance. In one embodiment, the frontal element is a steel sphere that provides advantageous penetration and weight re |
| 6837165 |
Bullet with spherical nose portion |
January 4, 2005 |
| A bullet includes a frontward facing aperture. Contained within the aperture is a relatively hard bullet frontal element that provides advantageous bullet impact performance. In one embodiment, the frontal element is a steel sphere that provides advantageous penetration and weight re |
| 5482747 |
Poly(vinyl alcohol) polymer blend textile sizes with improved ability to be desized |
January 9, 1996 |
| Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and other poly(vinyl alcohol) polymers are described which are useful as sizes, and have improved ability to be desized from fabrics compared with the other poly(vinyl alcohol) polymers alone. The specific |
| 5436293 |
Poly(vinyl alcohol) polymer blend textile sizes with improved ability to be desized |
July 25, 1995 |
| Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and other poly(vinyl alcohol) polymers are described which are useful as sizes, and have improved ability to be desized from fabrics compared with the other poly(vinyl alcohol) polymers alone. The specific |
| 5425879 |
Removal of base residues from poly(vinyl alcohol) reaction-slurries |
June 20, 1995 |
| Metallic, ash-producing residues which remain in poly(vinyl alcohol) polymer after its preparation from poly(vinyl acetate) are removed by a process which involves contacting a slurry of the poly(vinyl alcohol) polymer, after preparation and before polymer isolation, with ion-exchange |
| 5405653 |
Poly(vinyl alcohol)starch blends for textile sizes with improved ability to be desized |
April 11, 1995 |
| Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and various starches are described which are useful as sizes, and can have improved ability to be desized from fabrics compared with the starches alone. The specific poly(vinyl alcohol) copolymers useful in |
| 5362515 |
Poly(vinyl alcohol)copolymer sizes having high capacity to be desized |
November 8, 1994 |
| An improved process for producing woven textiles, comprising:a) sizing yam to be woven, with an aqueous solution of a poly(vinyl alcohol) copolymer containing from about 7 to 15 weight percent units derived frown a comonomer selected from the group consisting of an alkyl acrylate, an alk |
| 5322549 |
Polyimides and gas separation membranes prepared therefrom |
June 21, 1994 |
| A polyimide, and a gas separation membrane prepared therefrom, containing repeating units derived from 5(2,5-dioxo-tetrahydrofuryl)-3-methyl-3,3-cyclohexane-1,2-dicarboxylic anhydride is disclosed. |
| 5319070 |
Process for removal of ash from poly(vinyl alcohol) polymers |
June 7, 1994 |
| Metallic, ash-producing residues which remain in poly(vinyl alcohol) polymer after its preparation by hydrolysis of poly(vinyl acetate) are removed by a process which involves contacting a slurry of the poly(vinyl alcohol) polymer with ion-exchange resin particles, followed by removal of |
| 5232965 |
Stabilized polyacetal compositions |
August 3, 1993 |
| Incorporation of at least one hindered amine light stabilizer ("HALS") compound having a hindered phenol group and a piperidine ring or oxo-piperazinyl ring, provided that each such ring has a hindered amine, at the N.sup.4 position in the ring, that is of tertiary functionality, int |
| 5178650 |
Polyimide gas separation membranes and process of using same |
January 12, 1993 |
| Novel aromatic polyimide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides are derived from a variety of aromatic tetracarboxylic dianhydrides used to form aromatic polyimide gas separati |
| 5149723 |
Stabilized polyacetal compositions containing a mixture of HALS having tertiary functionality |
September 22, 1992 |
| This invention relates to polyacetal compositions that are stabilized against ultraviolet light and heat degradation due to the inclusion therein of a mixed hindered amine light stabilizer (HALS) system, wherein each HALS of the system contains a hindered amine that is of tertiary fu |
| 5091216 |
Reactive post treatment for gas separation membranes |
February 25, 1992 |
| A process is disclosed for sealing gas separation membranes through treatment with two monomeric materials which condense with each other to form a polymer such as a diamine and a di- or tri- acyl chloride. |
| 5085676 |
Novel multicomponent fluid separation membranes |
February 4, 1992 |
| A process for preparing multicomponent gas separation membranes is disclosed. The process involves casting two or more solutions of polymer, and partially removing solvent from the side of the cast polymer that is to form the gas separation layer of the membrane. The membrane is then |
| 5076817 |
Polyamide gas separation membranes and process of using same |
December 31, 1991 |
| Polyaramide gas separation membranes and the process of using them are disclosed. The polyaramide gas separation membranes have the formula, ##STR1## where --R-- is ##STR2## --Ar'-- is ##STR3## --Ar'-- is an aromatic moiety such as phenylene, naphthalene, or ##STR4## |
| 5063263 |
Polyacetal compositions containing a non-meltable polymer stabilizer improved with a minor amoun |
November 5, 1991 |
| Incorporation into polyacetal molding compositions stabilized for processing with a non-meltable polymer stabilizer of 0.01-1.00 weight percent of at least one meltable co-stabilizer, said co-stabilizer being a thermal stabilizer for polyacetal, and 0.02-1.0 weight percent of at least |
| 5034024 |
Surfactant treatment of aromatic polyimide gas separation membranes |
July 23, 1991 |
| A process for improving the permselectivity of an aromatic polyimide gas separation membrane comprising contacting the membrane with a solution of a surfactant in a solvent which swells the membrane but in which the membrane material is soluble to an extent of no more than 3% under the |
| 5032149 |
Surfactant treatment of polyaramide gas separation membranes |
July 16, 1991 |
| A process for improving the permselectivity of asymmetric polyaramide gas separation membranes is disclosed. The process involves contacting the membrane with a dilute solution of a surfactant in a solvent which preferably swells the membrane material. The surfactants are anionic, no |
| 5015270 |
Phenylindane-containing polyimide gas separation membranes |
May 14, 1991 |
| A permselective polyimide membrane having phenylindane residues incorporated into the polyimide backbone chain exhibiting high selectivity while maintaining good gas permeation rates and a process for using. |
| 4983191 |
Production of aromatic polyimide membranes |
January 8, 1991 |
| A process of producing a polyimide gas separation membranes comprising adding an oligomeric or polymeric aromatic epoxy resin to the dope solution, the resin being soluble in the polyimide or polyamic acid precursor, the solvent and the final membrane and the membrane comprising a bl |
| 4981497 |
Amine-modified polyimide membranes |
January 1, 1991 |
| Process of reacting polyimide membranes for separation of mixtures of fluids and particularly separation of mixtures of gas with primary or secondary mono-, di-, tri- or polyamines and the resultant products are disclosed. This modification results in improved gas permeation properties |
| 4972014 |
Polyacetal compositions containing a non-meltable polymer stabilizer improved with at least one |
November 20, 1990 |
| Incorporation into polyacetal molding compositions stabilized with a non-meltable polymer stabilizer of 0.02-1.0 weight percent of at least one amide-containing phenolic antioxidant results in significantly improved long term stability, as evidenced by greater retention of physical p |
| 4944775 |
Preparation of poly(phenylene oxide) asymmetric gas separation membranes |
July 31, 1990 |
| A process for producing integrally-skinned asymmetric poly(phenylene oxide) gas separation membranes is disclosed. The process involves forming a solution of the poly(phenylene oxide) in an aprotic solvent at an elevated temperature, forming a nascent membrane from the solution, partiall |
| 4935490 |
Highly soluble aromatic polyimides |
June 19, 1990 |
| Aromatic polyimides of the formula: ##STR1## where --Ar-- is ##STR2## --Ar'-- is ##STR3## --Ar"-- is ##STR4## where --Z, and --Z.sub.1, independently are --Cl, --Br or --I; where --X, --X.sub.1, --X.sub.2 and --X.sub.3 independently are --CH.sub.3 or --C.sub.2 |
| 4932983 |
Copolyimide gas separation membranes derived from substituted methylene dianilines and unsubstit |
June 12, 1990 |
| Semiflexible aromatic polyimides for preparing gas separation membranes and the process of using to separate at least one gas from a mixture of gases is disclosed. The aromatic polyimides are prepared by polycondensation of aromatic tetracarboxylic dianhydrides with 20 to 80 mol percent |
| 4932982 |
Copolyimide gas separation membranes derived from substituted phenylene diamines and substituted |
June 12, 1990 |
| An aromatic copolyimide gas separation membrane and the process of using it to separate one or more gases from a mixture of gases are disclosed. The aromatic copolyimide is the condensation product of a aromatic tetracarboxylic dianhydride with a phenylene diamine and a methylene dia |
| 4931539 |
Highly-soluble, amorphous siloxane polyimides |
June 5, 1990 |
| Highly-soluble, fully-cyclized siloxane polyimides, which contain at least in part, polymerized units derived from 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene]-bis(1,2-benzenedicarboxylic acid anhydride), (6FDA), are disclosed. The polymeric compositions, their preparation a |
| 4912197 |
Highly soluble clear polyimides |
March 27, 1990 |
| Highly soluble, optically transparent to clear aromatic polyimides in the visible range are disclosed. The dianhydrides from which the polyimides are prepared are 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene] bis(1,2-benzenedicarboxylic anhydride) which can be partially replaced |
| 4880442 |
Polyimide gas separation membranes |
November 14, 1989 |
| Aromatic polyimide gas separation membranes containing the repeating unit: ##STR1## where --Ar-- =is ##STR2## or mixtures thereof, ##STR3## or mixtures thereof Where --X, X.sub.1, X.sub.2, and X.sub.3 are independently primary or secondary alkyl groups having 1 to 6 carbo |
| 4863496 |
Reactive posttreatment for gas separation membranes |
September 5, 1989 |
| A process for applying and polymerizing a monomeric material to a gas separation membrane to improve the permselectivity of the membrane with respect to at least one pair of gases is disclosed. |
| 4851505 |
Highly soluble aromatic polyimides |
July 25, 1989 |
| Highly soluble, optically transparent aromatic polyimides of the following formula are disclosed: ##STR1## where --X and --X.sub.1 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms,--X is different than --X.sub.1,--Y is independently --H, or --Z,--Z is in |
| 4838900 |
Polyimide gas separation membranes |
June 13, 1989 |
| Aromatic polyimide gas separation membranes of the formula: ##STR1## or mixtures thereof, --R'--is ##STR2## linear alkylene groups of the formula (CH.sub.2).sub.1-3 or mixtures thereof, where --R" is ##STR3## are independently primary or secondary alkyl groups having 1 to |
| 4717394 |
Polyimide gas separation membranes |
January 5, 1988 |
| Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with diamines having alkyl substituents on all ortho positions to the amine functions, or with mixtures of diamines, some components having substituents on all positions ortho to the amine functions, are |
| 4717393 |
Polyimide gas separation membranes |
January 5, 1988 |
| Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with phenylene diamines having alkyl substituents on all ortho positions to the amine functions incorporating at least in part 3,3',4,4'-benzophenone tetracarboxylic dianhydride, are auto photochemically |
| 4705540 |
Polyimide gas separation membranes |
November 10, 1987 |
| A highly permeable aromatic polyimide gas separation membrane and the process of using it are disclosed. The aromatic polyimide has the formula ##STR1## wherein --Ar-- is ##STR2## or mixtures thereof, --X, --X.sub.1, --X.sub.2 and --X.sub.3 independently are alkyl groups havi |
| 4284457 |
Method for bonding a skin member to honeycomb core |
August 18, 1981 |
| Described herein is a method for bonding a skin member such as metal, plastic, perforated acoustic skin, or fiberglass or graphite reinforced plastic, to a honeycomb core support structure such as lightweight hollow hexagonally shaped tubes. Such a method can be used in the construction |
