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    • 53. 发明授权
    • Hair waving apparatus
    • US06604533B2
    • 2003-08-12
    • US10079724
    • 2002-02-21
    • Wendy A. HardenbrookWesley J. IshidaBrian AndersonKen DoucetteJohn Walsh
    • Wendy A. HardenbrookWesley J. IshidaBrian AndersonKen DoucetteJohn Walsh
    • A45D242
    • A45D2/40
    • A hair waving apparatus having at least two elements with undulations on each element for producing a wave in a lock of human hair is disclosed. The elements are pivotally connected and are biased toward each other and the elements are maintained in engagement with each other by a biasing means in the form of a spring to hold the lock of hair therebetween to impart a wave thereon. The undulations are dimensioned to allow each of the elements to nest within each other. A plurality of vents are disposed thereon the undulations to allow moisture to escape from the hair during hair styling and to hasten the hair drying process and subsequent wave formation in the hair. Additional features of the instant invention include retaining means in the form of a stop are disposed on each of the elements for maintaining each of the elements in engagement with each other and the stop cooperatively interacting with the spring to hold the lock of hair therebetween to impart a wave thereon; and a tab is disposed thereon each of the elements for disengaging the elements from each other when the elements are biased away from each other and the hair waving apparatus is in an open position. Guide means, such as a pin, disposed on each of the elements in alignment with a hole therein the elements and the pin cooperatively interacting with the hole and with the spring for positioning the undulations of the elements in close proximity to each other.
    • 56. 发明授权
    • Rapid sintering method for producing alumina-titanium carbide composites
    • 用于生产氧化铝 - 碳化钛复合材料的快速烧结方法
    • US5342564A
    • 1994-08-30
    • US999254
    • 1992-12-31
    • George C. WeiJohn Walsh
    • George C. WeiJohn Walsh
    • C04B35/117C04B35/10C04B35/52
    • C04B35/117
    • A method of making a sintered ceramic body for applications such as wear resistant parts and cutting tools. A green body is prepared from a powder mixture including alumina, TiC or (Ti(C,N)), a densification aid, and TiO.sub.2. The weight ratio of alumina to TiC in the body is about 40:60 to about 95:5; that of TiO.sub.2 to alumina plus TiC is 0:100 to about 2:98. The green body is rapid sintered by heating in a sintering atmosphere to about 1800.degree.-1920.degree. C. for a time sufficient to achieve a density of at least about 4.20 g/cc. The heating rate above about 800.degree. C. is between about 120.degree. C./min and the rate at which the green body experiences thermal shock. The sintering atmosphere is Ar-H.sub.2 or N.sub.2 -H.sub.2 in a molar ratio of Ar or N.sub.2 to H.sub.2 of about 92:8 to 100:0. Carbon monoxide is introduced to the sintering atmosphere only after the sintering temperature exceeds about 1400.degree. C. The amount of CO introduced is selected to inhibit reaction between the alumina and TiC. The CO may be introduced by placing a mass of graphite including adsorbed oxygen and water in the furnace at initiation of sintering such that the mass releases CO only after the sintering temperature exceeds 1400.degree. C. The body may be prepared from a homogeneous slurry, which is dried and shaped to form a green body having a density of at least about 30% of theoretical. The green body may be presintered, isopressed to collapse any cracks, macroscopic pores, or voids, and sintered or sintered and hot-isostatic-pressed.
    • 一种制造烧结陶瓷体的方法,用于诸如耐磨部件和切削工具的应用。 由包括氧化铝,TiC或(Ti(C,N)),致密化助剂和TiO 2的粉末混合物制备生坯。 体内氧化铝与TiC的重量比为约40:60至约95:5; TiO 2与氧化铝加TiC的比例为0:100至约2:98。 生坯通过在烧结气氛中加热至约1800°-1920℃快速烧结一段足以实现至少约4.20g / cc的密度的时间。 约800℃以上的加热速率在约120℃/分钟之间和生坯体经受热冲击的速率之间。 烧结气氛为Ar或N2与H2的摩尔比为约92:8至100:0的Ar-H2或N2-H2。 一氧化碳仅在烧结温度超过约1400℃后才被引入烧结气氛。选择引入的CO量以抑制氧化铝和TiC之间的反应。 可以通过在烧结开始时将包含吸附的氧和水的石墨块放置在炉中来引入CO,使得仅在烧结温度超过1400℃后质量释放CO。主体可以由均匀的浆料制备,其中 被干燥并成形以形成具有至少约30%的理论密度的生坯。 可以将生坯预烧,等压,以使任何裂纹,宏观孔或空隙倒塌,并烧结或烧结并热等静压。