Method and apparatus for perforation of sheet material by laser
Patent 4410785 Issued on October 18, 1983. Estimated Expiration Date: 
November 2, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 2, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsApplicationNo. 06/317058 filed on 11/02/1981US Classes:219/121.7, Hole punching219/121.71, Methods219/121.75, With lens219/121.77With sing sourceExaminersPrimary: Albritton, C. L.Attorney, Agent or FirmInternational ClassesA24C 5/00 (20060101)B23K 26/08 (20060101) B23K 26/067 (20060101) B23K 26/06 (20060101) AbstractIn providing perforation uniformity both in the spacing between multiple rows of perforations in sheet material and in the spacings among perforations within each row, a common laser beam is shared among the rows, being directed to the sheet material through a common focusing element for each adjacent pair of rows. In conducting the laser beam to each such common focusing element, a pair of modified beams is derived from the laser beam, each modified beam having light ray content divergent about an axis of symmetry thereof which is parallel to the optical axis of the focusing element.Other References
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