Patent ID: 11957162
Assignee: R.Y.L. INC.
Field: Other consumer goods (Other fields)
Classification: CPC A  B  C | IPC A  B  C

Claim 0:
1. A method of manufacturing a filter comprising:
providing a tube having a cylindrical wall and a hollow interior;
forming a first indentation within the tube in which a first portion of the cylindrical wall concaves into the hollow interior by applying heat to the first portion of the cylindrical wall and applying an inward pressure to the first portion of the cylindrical wall to collapse the first portion of the cylindrical wall into the hollow interior;
after forming the first indentation, rotating the tube about a longitudinal axis running through a center of the tube by a predetermined threshold; and
after said rotating, forming a second indentation within the tube in which a second portion of the cylindrical wall concaves into the hollow interior by applying heat to the second portion of the cylindrical wall and applying an inward pressure to the second portion of the cylindrical wall to collapse the second portion of the cylindrical wall into the hollow interior;
wherein the second portion of the cylindrical wall is radially separated from the first portion of the cylindrical wall about the longitudinal axis by the predetermined threshold, and the heat applied to the second portion is separate along the longitudinal axis from where the heat was applied to the first portion, and the first and second indentations are separated longitudinally; and
the first and second indentations create 1) a first chamber and a second chamber in the tube that are separated by both indentations and 2) a path within the hollow interior formed between the first and second indentations that fluidly couples both chambers together, wherein the path runs diagonally through the longitudinal axis of the filter.