Inventor
Padmasiri Daya Seneviratne
Inventor
Fullerton, CA, US
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling50%
Y10TTechnical subjects covered by former us classification25%
F16KValves13%
B66CCranes6%
E02BHydraulic engineering6%
PatentTitleYear
8,752,653'Dual ball upper internal blow out preventer valve'20147,287,544'Triple valve blow out preventer'20077,121,295'Internal blow out preventer ball and seat'20066,994,174'Washpipe assembly'20066,725,949'Washpipe assembly'20046,276,450'Apparatus and method for rapid replacement of upper blowout preventers'20014,423,645'Pipe spinner'19844,367,056'Marine platform jacket jack'19834,320,915'Internal elevator'1982Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1982–2007Patents assigned to VARCO INT (8)· patent assignee history
1982–2014Based in Fullerton, CA, US· patent location history
2014Patents assigned to BRAMAN ARTHUR W (1)· patent assignee history
2014Patents assigned to FOX PRESTON R (1)· patent assignee history
2014Patents assigned to NAT OILWELL VARCO LP (1)· patent assignee history
2014Patents assigned to SENEVIRATNE PADMASIRI DAYA (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| VARCO INT | 8 | 1982–2007 |
| BRAMAN ARTHUR W | 1 | 2014 |
| FOX PRESTON R | 1 | 2014 |
| NAT OILWELL VARCO LP | 1 | 2014 |
| SENEVIRATNE PADMASIRI DAYAself | 1 | 2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| Fullerton, California, US | 9 | 1982–2014 |