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
Amplifying system
摘要
申请公布号
US2322884(A)
申请公布日期
1943.06.29
申请号
US19410390450
申请日期
1941.04.26
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ROETKEN ALFRED A.
分类号
G10H1/043
主分类号
G10H1/043
代理机构
代理人
主权项
地址
您可能感兴趣的专利
GAS HUMIDIFIER FOR A MEDICAL RESPIRATOR
IMPROVEMENTS IN METHODS FOR THE MANUFACTURE BY SINTERING OF POROUS METALLIC PARTS AND PARTS MANUFACTURED THEREBY
NOUVEAU DISPOSITIF DE CONNEXION ELECTRIQUE ET DE PROTECTION CONTRE LES EFFETS DU GEL DES FEUX DE BALISAGE LUMINEUX ENCASTRES
TUYAUTERIE SOUPLE, RESISTANTE ET ISOLANTE ET SON PROCEDE DE
Chloropolysiloxanes prepn - by hydrolysing silanes with t-alcohols,use as water-proofing agents for buildings,leather,te
Bricklaying machine - for bricking up steel casting ladles
Resilient steel - by lowering transition temp of resilience by adding beryllium during casting
Molten metal distributor - for continuous teeming of large oxygen converters using two ladles
APPAREIL TENDEUR POUR COURROIE
CIRCUITS INTEGRES MONOLITHIQUES ET LEUR PROCEDE DE FABRICATION
(ANILINO SUBSTITUE) BENZOXAZOLES UTILES EN THERAPEUTIQUE
COPOLYMERES DE VINYLPYRIDINE, MEMBRANES A BASE DE CES COPOLYMERES PERMEABLES SELECTIVEMENT AUX ANIONS ET PROCEDE DE PREPARATION DE CES MEMBRANES
AQUEOUS INTERPOLYMER EMULSION
Elastic woven tape - for sliding clasp fasteners having high transverse elasticity
Solidified gas cryostat - with pressure-regulated equilibrium used to cool electronic components
2-(n,n-dialkylcarbamoylmethoxy)-5-halogen benzoic or - phenylacetic acid alkyl esters hypnotic agents
Watch bearings - prepd from compressed sintered alumina perforated and grooved simultaneously
Traveller assembly - for ring spinning machine from pre-formed components for heat or adhesive bonding
3,2-benzoxazepines - useful as antiinflammatory sedative anxiolytic,myorelaxing and hypnotic agents
Sheet metal tube joint - esp between parallel heat exchanger plates providing joining channel
