Class 73/64.54 - Molecular weight

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the determination is made by measuring
No. of patents: 26
Last issue date: 07/10/2007

Number	Title	Issue Date
7241620	Ultra high molecular weight polyethylene fractions having narrow molecular weight distributions and methods of making and using the same Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a Mw greater than about 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer b...	07/10/2007
7223603	Continuous on-line process control of residua distillation Ultrasonic spectroscopy, calorimetry, or thermogravimetric analysis provide measures which correlate with properties of asphaltene complex of petroleum residua which can be used to establish or maintain consistent properties of petroleum residua during blending or t...	05/29/2007
6925857	Method of determining an average length of reinforcing fiber in a sample of reinforcing fibers A method of determining an average length of reinforcing fiber in a sample of reinforcing fibers is disclosed. A sample of reinforcing fibers is weighed to obtain a total sample weight. The sample of reinforcing fibers is placed in a fiber separating mechanism and s...	08/09/2005
6868715	Method and apparatus for rapid determination of polymer molecular weight A rapid analysis method for the determination of polymer average molecular weight separates the polymer's high molecular weight fraction and determines its average molecular weight using a molar mass detector and a concentration detector. The method avoids time cons...	03/22/2005
6840092	Method and apparatus for rheometry, and its application to control of polymer manufacture A method and apparatus for studying the properties of a fluid are provided in which in which a rheometer is used to obtain, for example, value(s) indicative of the shear stress in the fluid to thereby obtain a set of data. The data is then directly compared using, f...	01/11/2005
6250138	Determining fluid bubble point pressure using an adjustable choke A method of determining the real time bubble point pressure of a fluid originating from a subsurface earth formation using an adjustable choke positioned downhole adjacent to the formation. The adjustable choke is placed into communication with the wellbo...	06/26/2001
6114170	Reagent for determining the ionic strength and/or the specific weight of aqueous liquids and method The invention relates to a method for determining the ionic strength and/or the specific weight of aqueous liquids and a reagent for this purpose, the composition of the reagent being such that the color change indicating the ionic strength is essentially...	09/05/2000
5858788	Reagent for determining the ionic strength and/or the specific weight of aqueous liquids, and method Reagent for determining the ionic strength and/or the specific weight of aqueous liquids and a reagent for this purpose, the composition of the reagent being such that the color change indicating the ionic strength is essentially directly dependent on the...	01/12/1999
5783063	Estimation of nucleic acid A method estimating a property or parameter of a nucleic acid material, which property or parameter is one to which the electrical conductivity of the nucleic acid material is related, comprises measuring the electrical conductivity of the nucleic acid ma...	07/21/1998
5739423	Method for determining thermodynamic and molecular properties in the liquid phase A method for calculating the average aggregate mass of individual molecules in a sample, where the molecules in solution associate to form clusters. Data sets of average aggregate mass of the sample versus concentration of the sample in the solvent are ge...	04/14/1998
5574215	Method for determining thermodynamic and molecular properties in the liquid phase A method for calculating the average molecular weight of individual molecules in a sample, where the molecules in solution associate to form clusters. Data sets of apparent molecular weight of the sample versus concentration of the sample in the solvent a...	11/12/1996
5348861	Device and method for the detection of microorganisms which produce low-molecular-weight metabolites Selective detection of microorganisms is achieved by a screening technique in which radioactively labeled, low-molecular-weight metabolites produced by microorganisms to be detected reach an adsorption medium through a semipermeable medium which passes th...	09/20/1994
5348884	Device and method for the detection of microorganisms which produce low-molecular-weight metabolites Selective detection of microorganisms is achieved by a screening technique in which radioactively labeled, low-molecular-weight metabolites produced by microorganisms to be detected reach an adsorption medium through a semipermeable medium which passes th...	09/20/1994
5341672	Method for measurement of polymer molecular weight based upon a temperature difference A molecular weight of a polymer is measured by a process including steps of: heating a polymer portion with a heating device, measuring, with a temperature measuring device, the difference between temperatures of at least two points of the polymer portion...	08/30/1994
5159898	Process and apparatus for utilization of fuels with alcohol additives for an internal combustion engine A process and apparatus for utilization of fuels with alcohol additives for an internal combustion engine which are characterized by the fact that at the present time comercial types of fuel have approximately the same molecular weights, which are clearly...	11/03/1992
5008204	Method for determining the compositional distribution of a crystalline copolymer A method for fractionating crystalline copolymers to determine solubility distribution as a function of temperature. Fractionation is conducted by passing a solvent through a column containing the crystallized copolymer at an increasing temperature from 6...	04/16/1991
4992168	Apparatus for fractionally measuring polymers An apparatus for fractionally measuring a polymer comprising: a flow path change valve unit A having an inlet for pouring a sample polymer solution, a loop for metering the sample polymer solution, an internal standard solution pouring mechanism including...	02/12/1991
4578990	Differential pressure capillary viscometer for measuring viscosity independent of flow rate and temperature fluctuations A means for measuring either the intrinsic or inherent viscosity of a solute in solution with a solvent which is independent of flow rate and temperature fluctuations. The solution is passed through one capillary tube and the solvent through a second capi...	04/01/1986
4530234	Method and system for measuring properties of fluids Method and system for measuring properties of fluids, particularly of reservoir fluids involved in enhanced oil recovery, comprising a pair of high pressure cells, each one of the cells having a floating piston therein which separates the respective cell ...	07/23/1985
4505149	Method and apparatus for determining molecular weight A method and apparatus for determining the molecular weight of an unidentified liquid component of given molecular weight by flow through an open capillary tube in the range of N=about 0.1 to N=about 10.0 where N=number of theoretical plates in the tube l...	03/19/1985
4351183	Apparatus and method for determining the osmolarity/specific gravity of a solution A novel apparatus and method for determining osmolarity and/or specific gravity of a sample solution, the apparatus including a plurality of test solutions, each test solution having a predetermined specific gravity within a predetermined specific gravity...	09/28/1982
4137753	Method and apparatus for monitoring the paraffinicity characterization of hydrocarbon mixtures A method for determining the Watson-Nelson characterization factor of hydrocarbons wherein the absolute viscosity and specific gravity are sensed providing first and second signals, respectively, corresponding to the absolute viscosity and specific gravit...	02/06/1979
4015462	Device and method for the determination of the specific gravity or osmolality of a liquid Devices and methods are provided for determining specific gravity or osmolality of liquids. The preferred devices comprise a carrier matrix incorporated with microcapsules having osmotically fragile, semipermeable polymeric membrane walls encapsulating th...	04/05/1977
3982422	Means for measuring the wax content of waxy oil The 50% boiling point, the gravity and the viscosity of waxy oil are sensed by sensors which provide corresponding signals. A computing circuit connected to the sensors provides a signal corresponding to the wax content of the waxy oil in accordance with ...	09/28/1976
3981183	Method and apparatus for measuring a physical property of a fluid material that varies nonlinearly relative to the density of the fluid A method and apparatus for measuring a physical property of a fluid material, such as concentration, that varies nonlinearly relative to the density of the fluid by measuring the density of the fluid and then injecting a fixed amount of a second miscible ...	09/21/1976
3965723	Wax content measuring means A system measures and records the API gravity the viscosity and the sulfur content of waxy lubricating oil and provides corresponding signals. A computing circuit develops a signal corresponding to the wax content in accordance with the sensed parameter s...	06/29/1976

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Class 73/64.54 - Molecular weight