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
Flapper valve
摘要
A subsurface valve for use in a well having a hinged flapper closure element and a moveable fluid pressure actuated operator element and a resilient member connecting the operator element to the closure element.
申请公布号
US4216830(A)
申请公布日期
1980.08.12
申请号
US19780957153
申请日期
1978.11.02
申请人
OTIS ENGINEERING CORP
发明人
FREDD, JOHN V
分类号
E21B34/00;E21B34/08;E21B34/10;(IPC1-7):E21B43/12;F16K17/00
主分类号
E21B34/00
代理机构
代理人
主权项
地址
您可能感兴趣的专利
IMAGING APPARATUS
POWER GENERATOR, POWER GENERATION SYSTEM, AND POWER GENERATION METHOD
DISTRIBUTED POWER FEEDING SYSTEM
DATA TRANSMISSION SYSTEM, GATEWAY, AND SERVER
FACSIMILE APPARATUS AND FACSIMILE COMMUNICATION SYSTEM
TRANSMISSION METHOD FOR WHITE SPACE INFORMATION AND WHITE SPACE INFORMATION PROVIDING DEVICE
GAME MACHINE
GAME CONTROL METHOD, COMPUTER, AND CONTROL PROGRAM
OYSTER HUSBANDRY METHOD
GAME MACHINE
POLYAMIDE-IMIDE RESIN-BASED HEAT-RESISTANT RESIN COMPOSITION, COATING FILM, COATED PLATE, AND HEAT-RESISTANT COATING
CURABLE RESIN COMPOSITION, COMPOSITION FOR ADDITIVES AND USES THEREOF
HOT MELT ADHESIVE SHEET FOR TEMPORARY FIXATION, LAMINATE AND PROCESSING METHOD OF MEMBER TO BE PROCESSED
DOUBLE-SIDED ADHESIVE TAPE
GRAPHITE SHEET POLYIMIDE FILM AND PRODUCTION METHOD THEREOF
LID MATERIAL FOR HIGH-FREQUENCY INDUCTION HEATING
SHEET POST-PROCESSING DEVICE
UNSATURATED POLYESTER WITH IMPROVED HEAT RESISTANCE AND METHOD OF IMPROVING HEAT RESISTANCE OF UNSATURATED POLYESTER
PEELING DEVICE AND PEELING METHOD OF LAMINATE, MANUFACTURING METHOD OF ELECTRONIC DEVICE
ELEVATOR GROUP MANAGEMENT CONTROL DEVICE AND ELEVATOR GROUP MANAGEMENT CONTROL METHOD