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US4886130A
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Nutational technique for limiting well bore deviation
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US4478295A
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Tuned support for cutting elements in a drag bit
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US4346591A
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Sensing impending sealed bearing and gage failure
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US4494749A
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Seal assemblies
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US4335791A
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Pressure compensator and lubricating reservoir with improved response to substantial pressure changes and adverse environment
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US4386458A
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Fatigue resistance for coupling and connection joint mechanisms
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US4386669A
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Drill bit with yielding support and force applying structure for abrasion cutting elements
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US4287957A
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Cooling a drilling tool component with a separate flow stream of reduced-temperature gaseous drilling fluid
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US4294492A
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Caliper seal assembly
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US4307786A
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Borehole angle control by gage corner removal effects from hydraulic fluid jet
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US4262758A
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Borehole angle control by gage corner removal from mechanical devices associated with drill bit and drill string
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US4291773A
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Strictive material deflectable collar for use in borehole angle control
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US4240674A
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Positive lubricating and indexing bearing assembly
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US4209684A
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Fusion technique of assembling rotary drill bit and adjusting gage of cutting elements
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US4240586A
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Method and apparatus for crushing and classifying particulate material
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US4245644A
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Breast prosthesis or augmenting form including spring-mass system
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US4211292A
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Borehole angle control by gage corner removal effects
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US4151051A
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Electrodeposition mining of materials from natural water bodies
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