Francis Alexander Cumming

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Rijswijk, NL

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Patents Grantslast 30 patents

Information Patent Grant
System for sealing the intersection between a primary and a branch...
- Patent number 6,244,337
- Issue date Jun 12, 2001
- Shell Oil Company
- Francis Alexander Cumming
- E21 - EARTH DRILLING MINING
Information Patent Grant
Creating zonal isolation between the interior and exterior of a wel...
- Patent number 6,070,671
- Issue date Jun 6, 2000
- Shell Oil Company
- Francis Alexander Cumming
- E21 - EARTH DRILLING MINING