37results about How to "Free from contamination" patented technology

A multiple dose syringe has a first valve defining a first valve opening pressure and a second valve defining a second valve opening pressure. A storage chamber in fluid communication with the second valve stores multiple doses of a substance therein and includes an outlet for dispensing multiple doses of the stored substance therethrough. A compression surface is movable between first and second positions and defines a compression chamber between the compression surface and the first valve. Movement of the compression surface in a direction from the first position toward the second position dispenses substance in the compression chamber through the first valve and out of the syringe. Movement of the compression surface in a direction from the second position toward the first position causes substance to flow from the storage chamber through the second valve and into the compression chamber.

The invention discloses a novel polyether-ether-ketone (peek) bar which is designed for solving the problems of slow crystallization speed caused by too large viscosity during processing and being too difficult to be processed caused by good metal cohesiveness after the forming by processing existing in a present PEEK bar. The invention comprises the following components according to weight proportion: 55.5 parts to 100 parts of peek resin, 2 parts to 4 parts of lubricant, 0.05 part to 0.5 part of nucleating agent and 0.05 part to 43 parts of filler. The invention also discloses the preparation method and use of the bar and has the advantages of fast molding, good processing performance and wide use.

The present application provides stable, carbene-functionalized composite materials, and methods and uses thereof. These carbene-functionalized composite materials comprise a material having a metal surface, and a carbene monolayer that is uniform, contaminant-free (metal oxide, etc), and more stable than thiol-functionalized monolayers. Uses of such carbene-functionalized composite materials include semi-conducting materials, microelectronic devices, drug delivery or sensing applications.

The invention discloses a torque measuring mechanism for a spanner. The torque measuring mechanism at least comprises a measuring barrel, a fixed ring and a sleeve, wherein a spiral track is sunken into the barrel, the measuring barrel can be stressed to automatically rotate, and the exterior of the barrel displays a plurality of scales; the fixed ring is used for limiting the measuring barrel toautomatically rotate without displacement; and the sleeve is limited at the outer part of the measuring barrel and provided with a window facing the scale part. The torque measuring mechanism can assist a user in easily identifying the torque value of the adjusted spanner.

The invention relates to a footed negative pressure tea cup cover, belonging to the technical field of tea cups. The footed negative pressure tea cup cover comprises a cup cover body (1) and a cup cover decoration (2) which are tightly combined. The footed negative pressure tea cup cover is characterized in that the cup cover body (1) and the cup cover decoration (2) are combined in a detachable and separable manner; and the cup cover body (1) is made from non-toxic food ware rubber. The invention overcomes limitation that the tea cup cover is dustproof only in the prior art and realizes the effects that the cup cover body (1) can generate a negative pressure suction force when the cup cover body (1) is slightly pressed during operation and negative pressure sealing and negative pressure fragrance keeping functions are created; the cup cover body (1) is adopted, thus matching universality of a cover and a cup is created; and when the cup cover decoration (2) is picked off from the cup cover body (1), the tea cup cover can be used as a negative pressure sealed ice basin cover, and versatility of the footed negative pressure tea cup cover is created. At least six small cylinders R are arranged at the cup cover body 1 at the top of a cup cover, the concave surface K of the cup cover is not polluted when the tea cup cover is laid flat, and the tea cup cover has a self antifouling function; and the cup cover decoration (2) can be made into animal modelling and fruit modelling artwork ornaments, and the whole footed negative pressure tea cup cover is a beautiful decorative tea cup cover.

The present invention relates to a cell culture medium additive comprising a xanthan polysaccharide and a mannan polysaccharide, such as a glucomannan or a galactomannan, that supports the growth of cells in suspension, and to a cell culture medium containing the additive. More particularly, but not exclusively, the present invention relates to a cell culture medium additive that supports the formation of multicellular bodies such as spheroids, and prevents sedimentation of cells without adversely affecting the physical properties of the cell culture medium.

A method is provided to remove a thickness of a sputter target surface deformation layer to thereby achieve a reduced burn-in time during sputtering operations. The method comprises extrusion hone polishing of the target surface with a visco-elastic abrasive medium.

The inventive device for measuring mass of movable fiber band has a compression body for compressing a fiber band, a measuring channel located on the compression body for receiving the compressed fiber band, and a sensor part (13) arranged at a measuring channel for measuring of pressure that is exerted by the fiber band in the channel. The sensor part (13) comprises a scanning element (5) for recording of the pressure, and a measuring body (6) for measuring the pressure, that is in movable and distanced connection to the scanning element. The measuring body (6) is sealed relative to the measuring channel (14) to avoid the contamination of the measuring member (6).

The invention relates to the design field of a nuclear industry box, in particular to a vertical butt-type universal hot-chamber maintenance air brake, which comprises an air brake main body and a dual-cover sealing door system, wherein the air brake main body is divided into a plurality of independent subareas, and all subareas are connected with one another through an air-brake sealing door; and the bottom of one independent subarea of the air brake main body is provided with a dual-cover sealing upper door, a top plate of a hot-chamber shell is provided with a corresponding dual-cover sealing lower door, and the dual-cover sealing upper door and the dual-cover sealing lower door form the dual-cover sealing door system. Due to the adoption of the vertical butt-type universal hot-chamber maintenance air brake, rapidness in butt joint and separation of multiple hot chambers can be realized through one air brake, the connection surface of the air brake after being separated is free from being polluted; and meanwhile, the vertical butt-type universal hot-chamber maintenance air brake has the advantages of high strength, good sealing performance, convenience in transportation and the like.

The invention provides non-destructive repair waterproof paint of an external wall. A water seepage region is effectively repaired under the condition that a wall surface of the external wall is not damaged, and the waterproof and pollution-resisting performances are good. According to the technical scheme provided by the invention, the non-destructive repair waterproof paint of the external wall comprises 50 percent to 70 percent of waterborne synthetic resin, 2 percent to 10 percent of silane nanoparticle, 10 percent to 30 percent of enhancement powder, 0.3 percent to 1 percent of a de-foaming agent, 0.1 percent to 0.3 percent of a bactericide and 0.3 percent to 1 percent of a thickening agent. The non-destructive repair waterproof paint is prepared by adopting the following method: adding the waterborne synthetic resin and the silane nanoparticle into a dispersion jar and uniformly stirring; adding and mixing the enhancement powder and the de-foaming agent, and uniformly stirring; adding the bactericide and mixing, and uniformly stirring; adding the thickening agent and mixing, and uniformly stirring; filtering and packaging.