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S & B Engineers Patents
S & B Engineers
Houston, TX
No. of patents:

Patent Number Title Of Patent Date Issued
4576235 Downhole relief valve March 18, 1986
A downhole relief valve connected to a tubing string in a producing well above the packer for controlling the well to prevent excess pressure built up in the annulus and casing damage following a tubing rupture at a point where the flowbore pressure exceeds the annulus pressure. The valv

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