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    Composite drain to be used in soil types having low water premeability
    52.
    发明授权
    Composite drain to be used in soil types having low water premeability 失效
    在具有低水可预期性的土壤类型中使用的复合排水

    公开(公告)号：US3765783A

    公开(公告)日：1973-10-16

    申请号：US3765783D

    申请日：1971-07-06

    申请人： PERSTORP AB ,  OREBRO PAPPERSBRUKS AB

    发明人： WAGER O

    IPC分类号： E01F5/00 ,  E02B11/00 ,  E02D3/10

    CPC分类号： E01F5/00 ,  E02B11/00 ,  E02D3/10 ,  Y10T428/24149 ,  Y10T428/24661 ,  Y10T428/24744

    摘要： Embankments for roads, railways etc are made by using material having low water permeability, such as clay. The material is laid up in different layers, which are separated from each other by means of horizontally arranged strips of drains. The drains comprise an inner core having wave-shaped surfaces and outer sheets of water filtering material, so that water from the clay may go through the outer sheets into the space between the inner core and the outer sheets and flow out.

    摘要翻译： 道路，铁路等堤岸采用粘土等低透水性材料制成。 该材料被放置在不同的层中，它们通过水平排列的排水排彼此分离。 排水管包括具有波形表面的内芯和外部过滤材料片，使得来自粘土的水可以穿过外片进入内芯和外片之间的空间并流出。

    Method for the production of decorative laminates having low tendency to flame-spreading
    53.
    发明授权
    Method for the production of decorative laminates having low tendency to flame-spreading 失效
    生产具有低延展性的装饰性层压板的方法

    公开(公告)号：US3647595A

    公开(公告)日：1972-03-07

    申请号：US3647595D

    申请日：1968-07-08

    申请人： PERSTORP AB

    发明人： SUNDEN NILS B

    IPC分类号： B32B27/06 ,  B32B27/42 ,  B44C5/04 ,  D06N7/06 ,  C09J3/14

    CPC分类号： D21H21/34 ,  B44C5/0469 ,  D21H5/0002 ,  D21H27/24 ,  D21H27/26 ,  Y10S428/921 ,  Y10T428/24851 ,  Y10T428/24934 ,  Y10T428/31967

    摘要： A PROCESS FOR THE PRODUCTION OF DECORATIVE LAMINATES HAVING CORE SHEETS AND DECORATIVE OVERLAY SHEETS WHICH COMPRISES COATING A CORE OF PHENOL-FORMALDEHYDE RESIN IMPREGNATED PAPER SHEETS CONTAINING AN AMINE-PHOSPHATE AS A FIRE RETARDANT WITH A RESIN SELECTED FROM THE GROUP CONSISTING OF MELAMINE-FORMALDEHYDE RESIN AND UREA-FORMALDEHYDE RESIN HAVING DISPERSED THEREIN AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE AND POLYVINYLIDENE CHLORIDE AND AT LEAST ONE MEMBER FROM THE GROUP CONSISTING OF ANTIMONY TRIOXIDE AND ALUMINA AND DISPOSING SAID COATED CORE SHEETS IMMEDIATELY ADJACENT TO THE LOWERMOST OF SAID DECORATIVE OVERLAY SHEETS, SAID DECORATIVE OVERLAY SHEETS COMPRISING PAPER SHEETS IMPREGNATED WITH A RESIN SELECTED FROM THE GROUP CONSISTING OF MELAMINE-FORMALDEHYDE RESIN AND UREA-FORMALDEHYDE RESIN.

    Process for producing iron-molybdate catalyst for oxidation of methanol to formaldehyde
    59.
    发明授权
    Process for producing iron-molybdate catalyst for oxidation of methanol to formaldehyde 失效
    生产用于将甲醇氧化成甲醛的铁 - 莫来斯催化剂的方法

    公开(公告)号：US3420783A

    公开(公告)日：1969-01-07

    申请号：US50583265

    申请日：1965-11-01

    申请人： PERSTORP AB

    发明人： BERGSTRAND STEN-AKE

    IPC分类号： B01J23/881 ,  B01J23/882 ,  B01J11/22

    CPC分类号： B01J23/882 ,  B01J23/881

    摘要： Iron molybdate catalyst is ground, optionally after air or oven-drying, mixed with water to give a mass containing 37-39% wt. moisture then pelletized with 90 mins. of mixing. The ground molybdate may have a max. particle size of 0.6 mm. Waste molybdate from the pelletizing may be returned to the grinding step. The pellets may have a diameter and axial length of 3.5 mm. The molybdate may be made by mixing solutions of ammonium molybdate and ferric chloride, the ppt. being filtered and washed. The filter cake has a MoO3/Fe2O3 wt. ratio of 5-6, and water content of 55-3"1/2"% wt. Drying of this ppt. may be at 80-107 DEG C. The pellets can be dried at 100 DEG C. for 12 hr. to a water content of