Method for making filter cigarettes using light energy to make perforations in the filter tipping wrap
US4224497A · kind A · utility
5Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | May 22, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/08
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Perforations are made at locations spaced about the periphery of a cigarette by conducting separate parts of a laser beam through respective separate light paths which intersect such spaced peripheral locations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.