首页
产品
黄页
商标
征信
会员服务
注册
登录
全部
|
企业名
|
法人/股东/高管
|
品牌/产品
|
地址
|
经营范围
发明名称
Telephone system
摘要
申请公布号
US2201573(A)
申请公布日期
1940.05.21
申请号
US19380240698
申请日期
1938.11.16
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CARPENTER WARREN W.;KITTREDGE LINUS E.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
您可能感兴趣的专利
WOOD PROTECTION BOARD
RECUPERACION DE NIQUEL Y COBALTO A PARTIR DEL MINERAL.
Compounds of 9-(3,5-dimethoxyphenyl)-5,8,8a,9-tetrahydrofuro [3',4' :6,7] naphtho [2,3-d][1,3] dioxol-6(5aH)-one, a process for their preparation and pharmaceutical compositions containing them
Water purification process, heat exchange surfaces on evaporation side of reboiler kept wetted to reduce fouling
ORGANIC ELECTROLUMINESCENT DISPLAY PANEL AND MANUFACTURING METHOD OF THE SAME
Treating and diagnosing macrophage-mediated diseases using Fc receptor ligands
OPTICAL CATALYTICAL PROBE FOR MEASURING ATOM CONCENTRATIONS OF OXIGEN, NITROGEN AND HYDROGEN IN GAS OR PLASMA
METHOD FOR THE PRODUCTION OF COMPOSITE GLASS
STEERING PLATE OF CROSS-COUNTRY SKI BINDINGS
SUBSTITUTED INDOLINONES HAVING AN INHIBITING EFFECT ON KINASES AND CYCLINE/CDK COMPLEXES
CARBOXAMIDOTHIAZOLE DERIVATIVES, PREPARATION, PHARMACEUTICAL COMPOSITIONS CONTAINING THEM
POLYMORPHIC FORM OF THE RECEPTOR TACHYKININ ANTAGONIST 2-(R)-(1-(R)-(3,(5-BIS(TRIFLUOROMETHYL)PHENYL)ETHOXY-3-(S)-(4-FLUO RO)PHENYL-4-(3-5(OXO-1H, 4H-1,2,4-TRIAZOLO)METHYLMORPHOLINE
METHOD FOR TREATING WATERS, SOILS, SEDIMENTS AND/OR SLUDGES
ACTIVATION COMPOSITION OF METALLOCENE COMPLEXES IN THE CATALYSIS OF CO-POLYMERIZATION OF OLEFINS
THIOBENZIMIDAZOLE DERIVATIVES
METHOD FOR THE PREPARATION OF ACIDIC SALTS OF TROVAFLOXACIN
DEVICE FOR FOLDING THIN-SHEET METAL COMPONENTS
INSTALLATION FOR GROWING CULTIVATED MUSSELS
METHOD FOR THE PREPARATION OF 2-DIETHYLAMINOETHYLISOTHIOURONIUM CHLORIDE HYDROCHLORIDE
METHOD FOR ENRICHING DRY CEMENT
