Fluid handling – Destructible or deformable element controlled – Destructible element
Reexamination Certificate
2005-04-01
2009-10-13
Lee, Kevin L (Department: 3753)
Fluid handling
Destructible or deformable element controlled
Destructible element
C137S068260, C220S089200, C220S203080
Reexamination Certificate
active
07600527
ABSTRACT:
A reverse acting rupture disc is provided having a laser defined electropolished line-of-weakness recess, and an improved method of forming an electropolished line-of-weakness recess in a reverse acting rupture disc that assures full opening of the disc upon reversal. A rupture disc blank is pre-bulged, final bulged, and then provided with a layer of resist material. A laser is used to remove at least a portion of the layer of resist material corresponding to a desired line-of-weakness recess in the concave face of the bulged rupture disc. The disc is then subjected to an electropolishing operation to remove metal from the lased area of the rupture disc, thereby forming a lustrous polished line-of-weakness recess in the disc of desired configuration and of a predetermined depth that is related to material thickness. The electropolished line of weakness is defined by spaced opposed channel portions separated by a central raised crown portion wherein the channel portions are of greater depth than the crown portion. The burst/reversal pressure of the disc having an electropolished line-of-weakness recess may be selectively controlled by varying the pre-bulging pressure on the disc.
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Search Report & Written Opinion prepared in PCT/US2006/10989, dated Oct. 4, 2007.
Krebill Michael D.
Leonard Brent W.
Shaw Bon F.
Stilwell Bradford T.
Fike Corporation
Hovey & Williams, LLP
Lee Kevin L
LandOfFree
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