Assignee
SPERRY SUN INC
US·29 granted patents·1,113 citations·filing 1973–1988
Top patents by PatentIndex Score
29 records- 0191US4293936ATelemetry systemSPERRY SUN INC·Filed 1978·Granted Oct 6, 1981·100 cites·33 claims
- 0289US4562559ABorehole acoustic telemetry system with phase shifted signalSPERRY SUN INC·Filed 1983·Granted Dec 31, 1985·89 cites·5 claims
- 0389US4298970ABorehole acoustic telemetry system synchronous detectorSPERRY SUN INC·Filed 1979·Granted Nov 3, 1981·96 cites·19 claims
- 0484US4535429AApparatus for signalling within a borehole while drillingSPERRY SUN INC·Filed 1983·Granted Aug 13, 1985·61 cites·16 claims
- 0584US4390975AData transmission in a drill stringSPERRY SUN INC·Filed 1980·Granted Jun 28, 1983·82 cites·3 claims
- 0684US4320473ABorehole acoustic telemetry clock synchronization systemSPERRY SUN INC·Filed 1979·Granted Mar 16, 1982·47 cites·16 claims
- 0782US4010642ABorehole pressure measurementSPERRY SUN INC·Filed 1975·Granted Mar 8, 1977·38 cites·22 claims
- 0880US4200297ASide entry clamp and packoffSPERRY SUN INC·Filed 1976·Granted Apr 29, 1980·56 cites·7 claims
- 0977US4848144AMethod of predicting the torque and drag in directional wellsSPERRY SUN INC·Filed 1988·Granted Jul 18, 1989·51 cites·38 claims
- 1077US4484785ATubing protectorSPERRY SUN INC·Filed 1982·Granted Nov 27, 1984·51 cites·27 claims
- 1177US4399877AContinuous borehole telemetry system and methodSPERRY SUN INC·Filed 1981·Granted Aug 23, 1983·50 cites·22 claims
- 1277US4156229ABit identification system for borehole acoustical telemetry systemSPERRY SUN INC·Filed 1977·Granted May 22, 1979·46 cites·17 claims
- 1377US4019148ALock-in noise rejection circuitSPERRY SUN INC·Filed 1975·Granted Apr 19, 1977·32 cites·14 claims
- 1472US4802150AMud pressure control system with magnetic torque transferSPERRY SUN INC·Filed 1981·Granted Jan 31, 1989·37 cites·10 claims
- 1572US4254481ABorehole telemetry system automatic gain controlSPERRY SUN INC·Filed 1979·Granted Mar 3, 1981·34 cites·16 claims
- 1669US4505155ABorehole pressure measuring systemSPERRY SUN INC·Filed 1983·Granted Mar 19, 1985·37 cites·20 claims
- 1769US4293937ABorehole acoustic telemetry systemSPERRY SUN INC·Filed 1979·Granted Oct 6, 1981·37 cites·4 claims
- 1867US4794336AApparatus for surveying a borehole comprising a magnetic measurement probe to be moved within a drill pipe to a measurment position within a non-magnetic collarSPERRY SUN INC·Filed 1987·Granted Dec 27, 1988·33 cites·8 claims
- 1957US4139836AWellbore instrument hangerSPERRY SUN INC·Filed 1977·Granted Feb 13, 1979·22 cites·13 claims
- 2054US4171578ABorehole toolSPERRY SUN INC·Filed 1977·Granted Oct 23, 1979·10 cites·6 claims
- 2153US4819336AMethod of determining the orientation of a surveying instrument in a boreholeSPERRY SUN INC·Filed 1987·Granted Apr 11, 1989·22 cites·3 claims
- 2251US4507958ASurveying of a borehole for position determinationSPERRY SUN INC·Filed 1983·Granted Apr 2, 1985·17 cites·12 claims
- 2346US4083117AAll angle borehole toolSPERRY SUN INC·Filed 1976·Granted Apr 11, 1978·12 cites·6 claims
- 2444US4810105ABearing sleevesSPERRY SUN INC·Filed 1987·Granted Mar 7, 1989·12 cites·8 claims
- 2541US3985027AControlled flow impedance in a pressure sensing systemSPERRY SUN INC·Filed 1975·Granted Oct 12, 1976·12 cites·8 claims
- 2637US4636995AMud pressure control systemSPERRY SUN INC·Filed 1985·Granted Jan 13, 1987·9 cites·10 claims
- 2737US4393598ABorehole toolSPERRY SUN INC·Filed 1982·Granted Jul 19, 1983·12 cites·8 claims
- 2832US4069591AElastomeric inclinometerSPERRY SUN INC·Filed 1976·Granted Jan 24, 1978·7 cites·13 claims
- 2914US3969662AMeasuring the angular position of a shaftSPERRY SUN INC·Filed 1973·Granted Jul 13, 1976·1 cites·22 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →