Assignee
KEYSTONE INT
US·96 granted patents·2,458 citations·filing 1974–1997
Top patents by PatentIndex Score
96 records- 0194US3982725AValve actuatorKEYSTONE INT·Filed 1974·Granted Sep 28, 1976·86 cites·14 claims
- 0292US4169543AAmplitude responsive detectorKEYSTONE INT·Filed 1977·Granted Oct 2, 1979·50 cites·54 claims
- 0391US5036884AMounting means for fluid pressure transmittersKEYSTONE INT·Filed 1990·Granted Aug 6, 1991·67 cites·20 claims
- 0490US5823228AValve manifoldKEYSTONE INT·Filed 1997·Granted Oct 20, 1998·59 cites·9 claims
- 0590US5007330ARotary actuator and seal assembly for use thereinKEYSTONE INT·Filed 1989·Granted Apr 16, 1991·45 cites·23 claims
- 0689US4846212ABleed valve assembly for double block and bleed systemKEYSTONE INT·Filed 1988·Granted Jul 11, 1989·51 cites·20 claims
- 0789US4616803ADeclutchable valve overrideKEYSTONE INT·Filed 1983·Granted Oct 14, 1986·63 cites·12 claims
- 0886US5579800ARotary valve position indicator and methodKEYSTONE INT·Filed 1994·Granted Dec 3, 1996·47 cites·29 claims
- 0985US4079746AValve assembly having adapter meansKEYSTONE INT·Filed 1975·Granted Mar 21, 1978·38 cites·10 claims
- 1084US5590684ADual pilot manifold assembly for a safety relief valveKEYSTONE INT·Filed 1995·Granted Jan 7, 1997·33 cites·27 claims
- 1184US5244183AFugitive emission sealing assemblyKEYSTONE INT·Filed 1991·Granted Sep 14, 1993·55 cites·39 claims
- 1283US5313976ATop entry ball valve and method of assemblyKEYSTONE INT·Filed 1993·Granted May 24, 1994·49 cites·10 claims
- 1382US5469805AHigh visibility valve position indicatorKEYSTONE INT·Filed 1994·Granted Nov 28, 1995·61 cites·18 claims
- 1482US4023432AActuator having universal-type joint assemblyKEYSTONE INT·Filed 1975·Granted May 17, 1977·24 cites·22 claims
- 1581US4399833AValve assemblyKEYSTONE INT·Filed 1982·Granted Aug 23, 1983·35 cites·13 claims
- 1681US4226118ALevel detectorKEYSTONE INT·Filed 1978·Granted Oct 7, 1980·37 cites·42 claims
- 1780US4846225ATransmission assembly for use with double block and bleed systemKEYSTONE INT·Filed 1988·Granted Jul 11, 1989·37 cites·15 claims
- 1880US3985151AValve actuatorKEYSTONE INT·Filed 1975·Granted Oct 12, 1976·51 cites·10 claims
- 1979US5518028AAdjustable magnet carrier for a valve position indicatorKEYSTONE INT·Filed 1994·Granted May 21, 1996·36 cites·26 claims
- 2079US5044257ARotary actuator and method for forming a rotary pistonKEYSTONE INT·Filed 1990·Granted Sep 3, 1991·46 cites·20 claims
- 2178US5054374ARotary actuatorKEYSTONE INT·Filed 1990·Granted Oct 8, 1991·50 cites·9 claims
- 2278US4589281AMaterial level detector and controlKEYSTONE INT·Filed 1984·Granted May 20, 1986·35 cites·43 claims
- 2378US4505290AValve seat assembly and valveKEYSTONE INT·Filed 1983·Granted Mar 19, 1985·31 cites·11 claims
- 2477US5012841APressure reducing and conditioning valvesKEYSTONE INT·Filed 1989·Granted May 7, 1991·46 cites·6 claims
- 2577US4189950AManual control apparatusKEYSTONE INT·Filed 1978·Granted Feb 26, 1980·28 cites·25 claims
- 2676US5494071AMounting system for pressure transmittersKEYSTONE INT·Filed 1994·Granted Feb 27, 1996·30 cites·1 claims
- 2776US5269347AFluid pressure isolator apparatusKEYSTONE INT·Filed 1992·Granted Dec 14, 1993·37 cites·7 claims
- 2876US4570901APositioning assembly for use with rotatable valvesKEYSTONE INT·Filed 1984·Granted Feb 18, 1986·32 cites·14 claims
- 2975US4541612ARotatable shaft assemblyKEYSTONE INT·Filed 1984·Granted Sep 17, 1985·29 cites·9 claims
- 3075US4275867AValve assembly and methodKEYSTONE INT·Filed 1978·Granted Jun 30, 1981·26 cites·15 claims
- 3174USRE34610EMounting means for fluid pressure transmittersKEYSTONE INT·Filed 1992·Granted May 17, 1994·29 cites·20 claims
- 3274US5292155AMethod and apparatus for mounting an instrument assembly on a main flow lineKEYSTONE INT·Filed 1992·Granted Mar 8, 1994·47 cites·11 claims
- 3374US4682758ADisk/stem connection apparatus for butterfly valveKEYSTONE INT·Filed 1986·Granted Jul 28, 1987·30 cites·19 claims
- 3472US4659064AApparatus for fixing the position of a valve element shaft in a boreKEYSTONE INT·Filed 1986·Granted Apr 21, 1987·32 cites·14 claims
- 3571US4280549AApparatus and process for die-castingKEYSTONE INT·Filed 1979·Granted Jul 28, 1981·13 cites·14 claims
- 3670US5005605AConditioning valveKEYSTONE INT·Filed 1989·Granted Apr 9, 1991·31 cites·2 claims
- 3770US4410163AValve seatKEYSTONE INT·Filed 1982·Granted Oct 18, 1983·25 cites·29 claims
- 3870US4222267AMaterial level detector circuitKEYSTONE INT·Filed 1978·Granted Sep 16, 1980·24 cites·47 claims
- 3968US4870989AHigh temperature safety relief systemKEYSTONE INT·Filed 1988·Granted Oct 3, 1989·26 cites·13 claims
- 4068US4711427AApparatus for connecting a valve element to a valve stemKEYSTONE INT·Filed 1986·Granted Dec 8, 1987·25 cites·7 claims
- 4167US4685611AButterfly valve construction having a composite seatKEYSTONE INT·Filed 1986·Granted Aug 11, 1987·32 cites·19 claims
- 4266US4773625ACorrosion-resistant overlay for the edge of butterfly valvesKEYSTONE INT·Filed 1987·Granted Sep 27, 1988·22 cites·21 claims
- 4366US4701938AData systemKEYSTONE INT·Filed 1985·Granted Oct 20, 1987·36 cites·23 claims
- 4465US4457490AHigh temperature valve and seat thereforKEYSTONE INT·Filed 1982·Granted Jul 3, 1984·21 cites·19 claims
- 4565US4080844AManual control apparatusKEYSTONE INT·Filed 1976·Granted Mar 28, 1978·17 cites·18 claims
- 4664US5011116AShock absorbing sealing means for flow control devicesKEYSTONE INT·Filed 1990·Granted Apr 30, 1991·26 cites·30 claims
- 4763US4848397AHigh temperature safety relief systemKEYSTONE INT·Filed 1988·Granted Jul 18, 1989·22 cites·13 claims
- 4863US4413393AMethod of manufacturing a valve assemblyKEYSTONE INT·Filed 1981·Granted Nov 8, 1983·18 cites·13 claims
- 4962US4967783ARecirculation valve with pilot valveKEYSTONE INT·Filed 1990·Granted Nov 6, 1990·29 cites·16 claims
- 5062US4941502ALow pressure recirculation valveKEYSTONE INT·Filed 1989·Granted Jul 17, 1990·33 cites·11 claims
Showing the top 50 of 96 patent records by PatentIndex Score.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →