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| United States Patent |
6,438,996
|
|
Cuvelier
|
August 27, 2002
|
Method for cracking off glassware
Abstract
A method for cracking off glassware (1), whereby glass pieces (1) are
subjected to a laser radiation treatment (F). In a first step, the part of
the glassware to be cracked off (3) is subjected in a region thereof to
the action of a continuous laser radiation beam (F) or to continuous laser
radiation beams (F) such that the beams touch the part (4) in the region
with a power density per unit area less than 30 W/mm.sup.2. In a second
step, successive points along a line in the part to be cracked off, which
has been subjected in the first step to the action of a continuous laser
radiation beam (F), are subjected to the action of a focused pulsating
laser beam (F) with power less than 250 W, such that, during this second
step, the successive points, in the line of the focused laser beam's
successive impact points on the part to be cracked off (3), are spaced
from each other.
| Inventors:
|
Cuvelier; Georges (Rue de la Corderie 11, B-7110 Houdeng-Goegnies, BE)
|
| Appl. No.:
|
445721 |
| Filed:
|
December 10, 1999 |
| PCT Filed:
|
June 10, 1998
|
| PCT NO:
|
PCT/BE98/00085
|
| 371 Date:
|
December 10, 1999
|
| 102(e) Date:
|
December 10, 1999
|
| PCT PUB.NO.:
|
WO98/56722 |
| PCT PUB. Date:
|
December 17, 1998 |
Foreign Application Priority Data
| Current U.S. Class: |
65/105; 65/112; 65/113; 219/121.67; 219/121.71 |
| Intern'l Class: |
C03B 033/00 |
| Field of Search: |
65/105,112,113,56,109
219/121.67,121.71
|
References Cited
U.S. Patent Documents
| 3935419 | Jan., 1976 | Lambert et al. | 65/113.
|
| 4146380 | Mar., 1979 | Caffarella et al.
| |
| 5902368 | May., 1999 | Witzmann | 65/112.
|
| Foreign Patent Documents |
| 25 21 612 | Dec., 1975 | DE.
| |
| 43 05 106 | Aug., 1994 | DE.
| |
| 43 05 107 | Aug., 1994 | DE.
| |
| 44 11 037 | Oct., 1994 | DE.
| |
| 44 34 648 | Apr., 1996 | DE.
| |
| 2376828 | Aug., 1978 | FR.
| |
| 92 15534 | Sep., 1992 | WO.
| |
| WO 94/22778 | Oct., 1994 | WO.
| |
Primary Examiner: Derrington; James
Attorney, Agent or Firm: Sughrue Mion, PLLC
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