| Patent Number |
Title Of Patent |
Date Issued |
| 7285225 |
Method and apparatus for concentrating a slurry |
October 23, 2007 |
| The current invention provides improved methods and filter stacks for concentrating a slurry of titanium dioxide. The improved filter stack comprises a series of filter disks and diverter trays arranged in parallel. The present invention provides an improvement over prior art filter |
| 4832928 |
Method for producing ammonium polyphosphate |
May 23, 1989 |
| A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315.degree.+/-15.degree. C. The slurry is reacted on a hot, continuously movin |
| 4829490 |
Electrical signal discrimination |
May 9, 1989 |
| The electrical response of a transducer contains a data-providing signal or signals superimposed on an unwanted time-variable background signal which is independent of the data-providing signal or signals. A system processing the transducer response utilizes an electronically stored |
| 4748263 |
Aromatic cyclotriphosphazenes |
May 31, 1988 |
| 4-Aminophenoxy cyclotriphosphazenes are reacted with maleic anhydride to produce maleamic acids which are converted to the maleimides. The maleimides are polymerized. By selection of starting materials (e.g. hexakis amino or trisaminophenoxy-trisphenoxy-cyclotriphosphazenes), selecti |
| 4748255 |
Thermally adaptive polymers and prepolymers and methods of making them |
May 31, 1988 |
| Reaction of an aromatic dianhydride with a polycyclic aromatic primary diamine at a controlled reaction rate yields a diamic acid dianhydride oligomer. The oligomer may be a precursor for an imide foam which forms at low temperature, has outstanding physical characteristics, and is e |
| 4687785 |
Thermally adaptive polymers and prepolymers and methods of making in which an imide is formed fr |
August 18, 1987 |
| Reaction of an aromatic dianhydride with a polycyclic aromatic primary diamine at a controlled reaction rate yields a diamic acid dianhydride oligomer. The oligomer may be a precursor for an imide foam which forms at low temperature, has outstanding physical characteristics, and is e |
| 4687651 |
Method for producing ammonium polyphosphate |
August 18, 1987 |
| A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315.degree.+/-15.degree. C. The slurry is reacted on a hot, continuously movin |
| 4682296 |
Ultrasonic imaging |
July 21, 1987 |
| Ultrasonic imaging equipment comprising ultrasonic transducers (A, B, etc.) which are sequentially and repetitively triggerable by equally spaced triggers (Z) to give echoes which can be read, stored and processed in a computer-based recording device is characterized in having means to |
| 4668589 |
Aminophenoxycyclotriphosphazene cured epoxy resins and the composites, laminates, adhesives and |
May 26, 1987 |
| Aminophenoxycyclotriphosphazenes such as hexakis(4-aminophenoxy)cyclotriphosphazene and tris(4-aminophenoxy)-tris phenoxyclyclotriphosphazene are used as curing agents for epoxy resins. These 1,2-epoxy resins are selected from di- or polyepoxide-containing organic moieties of the for |
| 4649189 |
Process for preparing phthalocyanine polymer from imide containing bisphthalonitrile |
March 10, 1987 |
| Imide-linked bisphthalonitrile compounds are prepared by combining a dicyano aromatic diamine and an organic dianhydride to produce an amic acid linked bisphthalonitrile copound. The amic acid linked bisphthalonitrile compound is dehydrocyclized to produce the imide-linked bisphthalo |
| 4647615 |
Structural panels |
March 3, 1987 |
| Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers and su |
| 4634759 |
Fire and heat resistant laminating resins based on maleimido substituted aromatic cyclotriphosph |
January 6, 1987 |
| 4-Aminophenoxy cyclotriphosphazenes are reacted with maleic anhydride to produce maleamic acids which are converted to the maleimides. The maleimides are polymerized. By selection of starting materials (e.g. hexakis amino or trisaminophenoxy-trisphenoxy-cyclotriphosphazenes), selecti |
| 4626593 |
Vinyl stilbazoles |
December 2, 1986 |
| Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are su |
| 4618652 |
Process for curing bismaleimide resins |
October 21, 1986 |
| When vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are admixed with bismaleimides and cured to form copolymers the cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone. |
| 4600769 |
Amine terminated bisaspartimide polymer |
July 15, 1986 |
| Novel amine terminated bisaspartimides, especially 4,4'-bis{N.sup.2 -[4-(4-aminophenoxy)phenyl]aspartimido} diphenylmethane are prepared by a Michael-type reaction of an aromatic bismaleimide and an aromatic diamine in an aprotic solvent. These bisaspartimides are thermally polymerized t |
| 4598007 |
Light weight fire resistant graphite composites |
July 1, 1986 |
| Composite structures having a honeycomb core and characterized by lightweight and excellent fire resistance are provided. These sandwich structures employ facesheets made up of bismaleimide-vinyl styrylpyridine copolymers with fiber reinforcement such as carbon fiber reinforcement. In |
| 4579782 |
Laminate comprising fibers embedded in cured amine terminated bis-imide |
April 1, 1986 |
| Novel amine terminated bisaspartimides, especially 4,4'-bis{N.sup.2 -[4-(4-aminophenoxy)phenyl]aspartimido}diphenylmethane are prepared by a Michael-type reaction of an aromatic bismaleimide and an aromatic diamine in an aprotic solvent. These bisaspartimides are thermally polymerized to |
| 4568733 |
High performance mixed bisimide resins and composites based thereon |
February 4, 1986 |
| The present invention relates to mixed bismaleimide/biscitraconimide resins. Mixtures of the two resins produces materials which have better handling, processing or mechanical and thermal properties, particularly in graphite composites, than materials made with the individual resins. The |
| 4550177 |
Maleimido substituted aromatic cyclotriphosphazenes |
October 29, 1985 |
| 4-Aminophenoxy cyclotriphosphazenes are reacted with maleic anhydride to produce maleamic acids which are converted to the maleimides. The maleimides are polymerized. By selection of starting materials (e.g. hexakis amino or trisaminophenoxy-trisphenoxy-cyclotriphosphazenes), selecti |
| 4537834 |
Metal (II) 4,4',4",4'"-phthalocyanine tetraamines as curing agents for epoxy resins |
August 27, 1985 |
| Metal, preferably divalent copper, cobalt or nickel, phthalocyanine tetraamines are used as curing agents for epoxides. The resulting copolymers have high thermal and chemical resistance and are homogeneous. They are useful as binders for laminates, e.g. graphite cloth laminate. |
| 4531069 |
Logarithmic amplifiers |
July 23, 1985 |
| A logarithmic amplifier with a large range of input signal magnitude at high frequency. The amplifier comprises a number of similar stages arranged in cascades. Each stage has a logarithmic converter and an input stage constructed to maintain a consistent phase of signal and to feed a |
| 4526925 |
Copolymers of vinyl styrlpyridines or vinyl stilbazoles with bismaleimide |
July 2, 1985 |
| Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are su |
| 4522755 |
Metal phthalocyanine intermediates for the preparation of polymers |
June 11, 1985 |
| Metal 4, 4', 4", 4"'-tetracarboxylic phthalocyanines (MPTC) are prepared by reaction of trimellitic anhydride, a salt or hydroxide of the desired metal (or the metal in powdered form), urea and a catalyst. A purer form of MPTC is prepared than heretofore. These tetracarboxylic acids are |
| 4499260 |
Phthalocyanine polymers |
February 12, 1985 |
| Method of forming 4,4',4",4'"-tetraamino phthalocyanines by reducing 4,4',4",4'"-tetranitro phthalocyanines, polymerization of the metal tetraamino phthalocyanines with a tetracarboxylic dianhydride (preferably aromatic) or copolymerization with a tetracarboxylic dianhydride and a di |
| 4496701 |
Phosphorus-containing imide resins |
January 29, 1985 |
| Cured polymers of bis- and tris-imides derived from tris(m-aminophenyl) phosphine oxides by reaction with maleic anhydride or its derivatives, and addition polymers of such imides, including a variant in which a mono-imide is condensed with a dianhydride and the product is treated with |
| 4463465 |
Fire blocking systems for aircraft seat cushions |
August 7, 1984 |
| A configuration and method for reducing the flammability of bodies of organic materials that thermally decompose to give flammable gases is disclosed to comprise covering the body with a flexible matrix that catalytically cracks the flammable gases to less flammable species. Optional |
| 4450268 |
Metal phthalocyanine polymers |
May 22, 1984 |
| The invention relates to metal, primarily divalent metal such as divalent copper, cobalt and nickel, 4,4',4", 4'" phthalocyanine tetracarboxylic acids and to polymers prepared by heating the same, and to a method of preparing the tetracarboxylic acids.A method is provided for preparing t |
| 4433115 |
Phosphorus-containing imide resins |
February 21, 1984 |
| Flame-resistant reinforced bodies are disclosed which are composed of reinforcing fibers, filaments or fabrics in a cured body of bis- and tris-imide resins derived from tris(m-aminophenyl) phosphine oxides by reaction with maleic anhydride or its derivatives, or of addition polymers |
| 4421820 |
Elastomer-modified phosphorus-containing imide resins |
December 20, 1983 |
| Phosphine oxide-containing polyimide resins modified by elastomers, having improved mechanical properties and particularly useful in the production of fiber or fabric-reinforced composites or laminates. |
| 4395557 |
Phosphorus-containing imide resins |
July 26, 1983 |
| Bis- and tris-imides derived from tris(m-aminophenyl) phosphine oxides by reaction with maleic anhydride or its derivatives, and addition polymers of such imides, including a variant in which a mono-imide is condensed with a dianhydride and the product is treated with a further quantity |
| 4265166 |
Corrosion resistant membrane for chimney liner |
May 5, 1981 |
| A carbon steel (or other type) chimney liner is provided with an inner membrane of relatively light gauge steel which is highly resistant to corrosion and which is constructed to accommodate thermal expansion in any direction independent of the structure to which it is attached. The |
| 4193829 |
Process for the manufacture of low density bis-maleimide-carbon microballoon composites |
March 18, 1980 |
| A process for the preparation of composite laminate structures of glass cloth preimpregnated with polybismaleimide resin and adhered to a polybismaleimide-glass or aromatic polyamide paper honeycomb cell structure filled or partially filled with a syntactic foam consisting of a mixtu |
| 4135019 |
Low density bismaleimide-carbon microballoon composites |
January 16, 1979 |
| A process for the preparation of composite laminate structures of glass cloth preimpregnated with polybismaleimide resin and adhered to a polybismaleimide glass or aromatic polyamide paper honeycomb cell structure filled or partially filled with a syntactic foam consisting of a mixtu |
| 4061812 |
Honeycomb-laminate composite structure |
December 6, 1977 |
| A honeycomb-laminate composite structure comprisingA. a cellular core of a polyquinoxaline foam in a honeycomb structure, andB. a layer of a non-combustible fibrous material impregnated with a polyimide resin laminated on the cellular core,A process for producing the honeycomb-laminate composite |
