Apparatus for scraping the walls of well bores,申请号US19480011396-传众专利搜索

首页产品黄页商标征信

会员服务注册登录

法人/股东/高管

发明名称	Apparatus for scraping the walls of well bores
摘要
申请公布号	US2482985(A)	申请公布日期	1949.09.27
申请号	US19480011396	申请日期	1948.02.27
申请人	FRANCIS LOCKWOOD JOHN	发明人	LOCKWOOD JOHN FRANCIS
分类号	E21B37/02	主分类号	E21B37/02
代理机构		代理人
主权项
地址

您可能感兴趣的专利

METHOD FOR PREVENTING HYGROSCOPY OF DIELECTRIC PROTECTIVE LAYER USED FOR FORMING DISPLAY

METHOD FOR FORMING FLUORESCENT LAYER OF PLASMA DISPLAY DEVICE THROUGH GREEN TAPE COATING BY USING SOLVENT

METHOD FOR TRANSMITTING A VOICE MESSAGE TO A MOBILE PHONE AND A COMPUTER DEVICE THEREFOR, PARTICULARLY REGARDING TO TRANSMITTING A VOICE MESSAGE NOT DEMANDING PROMPT TRANSMISSION WITHOUT OUTPUTTING A BELL SOUND IN A MOBILE PHONE OF A RECEIVER

LEAD WIRE PROTECTION TOOL COMPOSED OF A BODY HAVING A SETTLING SPACE AND A PAIR OF MOUNTING UNITS AND AN INDOOR DEVICE WITH THE SAME FOR AN AIR CONDITIONER

METHOD FOR TRANSMITTING SHORT MESSAGES IN LARGE QUANTITIES AND A SYSTEM THEREFOR, PARTICULARLY FOR TRANSMITTING SHORT MESSAGES TO A PLURALITY OF RECEIVERS AT THE SAME TIME

SEMICONDUCTOR DEVICE

METHOD AND SYSTEM FOR PROVIDING MANDATORILY CONVERTIBLE SECURITIES WITH AN ASSOCIATED CALL SPREAD AGAINST A TRUST

CERVICAL SPINE FIXING APPARATUS AND DRIVER USED THEREIN FOR FACILITATING OPERATIONS AND REDUCING OPERATION DURATIONS

SYSTEM AND METHOD FOR REPRODUCING VOICE SIGNALS CAPABLE OF CONTROLLING EACH OF PLURAL SPEAKERS

LIGHTING DEVICE FOR BUILT-UP TYPE DISPLAY RACK FOR IMPROVING DISPLAY EFFECTS AND INCREASING USER CONVENIENCE

CASINO CHIP FOR PREVENTING THEFT BY EMBEDDING ELECTROMAGNETIC LABEL AND MANUFACTURING METHOD OF ANTITHEFT CASINO CHIP

DELAY LOCKED LOOP FOR GENERATING MULTI-PHASE CLOCKS IMPLEMENTED WITHOUT VOLTAGE-CONTROLLED OSCILLATOR AND CAPABLE OF OUTPUTTING THE MULTI-PHASE CLOCKS STABLY

METHOD AND APPARATUS FOR DEPOSITING OPTICAL FIBER PREFORM BY USING SOUND WAVE TO ACTIVATE FLOW OF DEPOSITION GAS TO QUARTZ TUBE OR QUARTZ STICK

METHOD OF DESIGNING TEST PATTERN FOR BLOCKING GATE TO REDUCE NUMBER OF UNNECESSARY PROCESSES

DEFROST SYSTEM OF A REFRIGERATOR BY USING A CONDUCTIVE PLATE FOR CONDUCTING HEAT FROM A HEATING AREA OF A DEFROST HEATER INSTALLED AT THE LOWER SIDE OF AN EVAPORATOR TO THE SIDE OF THE EVAPORATOR

DEVICE FOR DETECTING KIND OF BOLT TO WELD RIGHT BOLT INTO VEHICLE BODY PANEL BY SORTING WELDING BOLTS ON JIG ACCORDING TO LENGTH

LCD WITH BLASTED CORNERS ADJACENT TO DISCHARGE ELECTRODES

VOLTAGE LEVEL SHIFTER WITH PULL-UP AND PULL-DOWN DRIVERS SELECTIVELY DRIVEN AT TRANSITION PERIODS OF INPUT SIGNAL

VARIABLE DISPLACEMENT ROTARY COMPRESSOR FOR CHANGING AUTOMATICALLY A SUCTION PASSAGE TOWARD ONE OPERATED COMPRESSION CHAMBER BY A PASSAGE CHANGING UNIT

VARIABLE DISPLACEMENT ROTARY COMPRESSOR FOR SMOOTHING THE ROTATION OF A ROLLER OF A LOW PRESSURE SIDE BY ACTING EQUALLY PRESSURE ACTING FROM A HIGH PRESSURE SIDE TO BOTH AXIAL ENDS OF THE ROLLER OF THE LOW PRESSURE SIDE