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
Drawworks
摘要
申请公布号
US2240741(A)
申请公布日期
1941.05.06
申请号
US19400317313
申请日期
1940.02.05
申请人
THE NATIONAL SUPPLY COMPANY
发明人
SPALDING JOHN D.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
您可能感兴趣的专利
HYDROGEN STORAGE ALLOY, HYDROGEN SEPARATION MEMBRANE, HYDROGEN STORAGE TANK AND METHOD FOR STORING/DISCHARGING HYDROGEN
Method and Display Data Entry Unit
ULTRASOUND SYSTEM FOR FUSING AN ULTRASOUND IMAGE AND AN EXTERNAL MEDICAL IMAGE
Medical tube inserted in body cavity of patient and medical device set using the same
Switching mode power supply and driving method
Shape Evaluation Method, Shape Evaluation Device, And Device Having The Shape Evaluation Device
ALL-IN-ONE HOME THEATER SYSTEM
SYSTEM AND METHOD FOR ROUTING PACKET TRAFFIC
Method for selective laser crystallization and display panel fabricated by using the same
DEVICE FOR MONITORING A WASH PROCESS
LINK POWER SAVING STATE
SUBSTRATE PROCESSING APPARATUS AND SUBSTRATE PROCESSING TERMINATION DETECTION METHOD
FLASHLIGHT HAVING MATING FORMATIONS FOR INTEGTRATION WITH A RAIL MOUNTING SYSTEM
ULTRASONIC ENERGY SYSTEM AND METHOD INCLUDING A CERAMIC HORN
Minimum classification error training with growth transformation optimization
System and method for canceling acoustic echoes in audio-conference communication systems
Sensor configurations in a user input device
PAINTBALL GUN PERCUSSION STRUCTURE
FLOWMETER
SOLENOID VALVE WITH IONIZER, VACUUM CHUCK ARRANGED WITH IONIZER, AND RECEIVING STAND WHEREIN IONIZER IS DISPOSED
