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US 6,649,102 B2Granted
Method of cutting expanded graphite sheet material
AssigneeBallard Power Systems Inc.
InventorsNeil V. Davis, David Brown
Life of this patent
Estimating the term…
Abstract
In a method and apparatus for cutting expanded graphite sheet material, at least one cutting tool is urged against the sheet(s). The cutting tool has at least one ridge extending therefrom, that includes a substantially tapered cross-section having sloping sides and an edge surface. At least a portion of the sheet material is displaced as the ridge is urged against the sheet. A region of the sheet material in contact with the ridge is compressed so that the density of the region reaches or exceeds the breaking density of the sheet.
Claims18
A method for cutting an expanded graphite sheet, said method comprising:
- (a) urging at least one cutting tool against said sheet, said cutting tool having at least one ridge extending therefrom, said ridge comprising a substantially tapered cross-section having sloping sides and an edge surface;
- (b) displacing at least a portion of the material comprising said sheet as said ridge is urged against said sheet;
- and
- (c) compressing a region of said sheet in contact with said at least one ridge so that the density of said region at least reaches the breaking density of said sheet.
1 more element
Dependencies are inferred from the claim text.