Inventor
Walter R. Chapman
Inventor
Kingwood, TX, US
Overview
Patents· 10 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling24%
H01JElectric discharge tubes or discharge lamps18%
F16KValves12%
H01KElectric incandescent lamps12%
F04CRotary-piston, or oscillating-piston, positive-displacement machines for liquids6%
G01NInvestigating or analysing materials by determining their chemical or physical properties6%
H04BTransmission6%
Y02ATechnologies for adaptation to climate change6%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%
Y10TTechnical subjects covered by former us classification6%
PatentTitleYear
10,598,006Methods and systems for downhole sensing and communications in wells20207,940,043'NMR method of detecting precipitants in a hydrocarbon stream'20117,373,980'Mono-trip cement thru completion'20087,228,897'Cement through side pocket mandrel'20077,069,992'Mono-trip cement thru completion'20065,896,004'Double ended quartz lamp with end bend control'19995,430,353'Lamp inlead assembly having a formed foil arrangement'19955,019,743'Mount structure for double ended lamp'19914,826,134'Intake valve for air compressors and the like'19893,999,568'Self unloading check valve'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1989Patents assigned to CHAPMAN WALTER R (2)· patent assignee history
1976–1989Based in Erie, PA, US· patent location history
1991–2020Patents assigned to GEN ELECTRIC (4)· patent assignee history
1991–1999Based in Cleveland Heights, OH, US· patent location history
1995Based in Cleveland, OH, US· patent location history
2006–2008Patents assigned to BAKER HUGHES INC (3)· patent assignee history
2006–2020Based in Kingwood, TX, US· patent location history
2011Patents assigned to UNIV RICE WILLIAM M (1)· patent assignee history
2011Based in Houston, TX, US· patent location history
2020Patents assigned to BAKER HUGHES OILFIELD OPERATIONS LLC (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| GEN ELECTRIC | 4 | 1991–2020 |
| BAKER HUGHES INC | 3 | 2006–2008 |
| CHAPMAN WALTER Rself | 2 | 1976–1989 |
| BAKER HUGHES OILFIELD OPERATIONS LLC | 1 | 2020 |
| UNIV RICE WILLIAM M | 1 | 2011 |
Locations
| Location | Patents | Span |
|---|---|---|
| Kingwood, Texas, US | 4 | 2006–2020 |
| Cleveland Heights, OH, US | 2 | 1991–1999 |
| Erie, Pennsylvania, US | 2 | 1976–1989 |
| Houston, Texas, US | 1 | 2011 |
| Cleveland, OH, US | 1 | 1995 |