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    • 2. 发明专利
    • Improvements in and relating to the manufacture of aromatic amino carboxylic acids
    • GB636333A
    • 1950-04-26
    • GB523247
    • 1947-02-22
    • HERTS PHARMACEUTICALS LTDDAVID DUNCANSON MARTINDONALD EDWIN SEYMOURFRANK STUART SPRING
    • Alkali metal salts of 4-amino-2-hydroxy benzoic acid are prepared by the reaction of carbon dioxide with m-aminophenol in the presence of an alkali metal hydroxide, carbonate or p bicarbonate and water, preferably at a temperature of over 100 DEG C. Conveniently, the reaction may be carried out by heating m-amino phenol with the alkali-metal compound and solid carbon dioxide in an autoclave at about 130 DEG C. The free acid may be liberated from the reaction product by adding dilute hydrochloric acid until just acid to litmus, or by dissolving in an excess of hydrochloric acid to form the aminoacid hydrochloride which is separated and dried and treated with an equivalent quantity of an alkali metal bicarbonate and just sufficient water to dissolve the alkali metal chloride formed. In examples: (1) m-aminophenol, potassium bicarbonate, solid carbon dioxide and water are heated in an autoclave and the reaction product is neutralized with hydrochloric acid to give 4-amino-2-hydroxy benzoic acid; (2) sodium bicarbonate is used in place of potassium bicarbonate in (1) and (3), the process (1) is repeated using gaseous carbon dioxide in place of solid carbon dioxide and the product is separated by means of the aminoacid hydrochloride. Reference has been directed by the Comptroller to Berichte der Deutschen Chemischen Gesellschaft (Referat), Volume 23 (1890), page 313.
    • 8. 发明申请
    • Kit for plugging a hole with a fire resistant material
    • 用耐火材料堵塞孔的套件
    • US20080216432A1
    • 2008-09-11
    • US12028858
    • 2008-02-11
    • Vincent F. CannistraroDouglas C. DaytonDavid Duncanson
    • Vincent F. CannistraroDouglas C. DaytonDavid Duncanson
    • E04G23/02
    • F16L5/04
    • Methods and systems for securing cored penetration in a concrete slab are described. The method and system may include providing a concrete hole plug. The concrete hole may include a lower hole plug and a top cover securely attached to the lower hole plug for sealing the hole. The lower hole plug may include an adhesive on the outside surface for adhering to the concrete wall of the hole and a well for holding fire-resistant sealant to form a perimeter seal on installed pipe. The top cover may include one or more securing mechanism for attaching the top cover to the hole plug. Further, the method and system may include exposing the adhesive on the outside surface of the lower hole plug, disposing the concrete hole plug into a hole bored in a concrete slab and securing the top cover to the lower hole plug using the securing mechanism.
    • 描述了用于确保混凝土板中岩心渗透的方法和系统。 该方法和系统可以包括提供一个混凝土孔塞。 混凝土孔可以包括下孔塞和顶盖,其牢固地附接到下孔塞以密封孔。 下孔塞可以包括在外表面上用于粘附到孔的混凝土壁上的粘合剂,以及用于保持防火密封剂以在安装的管上形成周边密封的孔。 顶盖可以包括用于将顶盖附接到孔塞的一个或多个固定机构。 此外,该方法和系统可以包括将粘合剂暴露在下孔塞的外表面上,将混凝土孔塞设置在钻孔在混凝土板中的孔中,并使用固定机构将顶盖固定到下孔塞。