Patent ID: 11918030
Assignee: PHILIP MORRIS USA INC.
Field: Chemical engineering (Chemistry)
Classification: CPC A  B | IPC A  B

Claim 5:
6. A method of changing a screen of a screen assembly of a treatment vessel, comprising:
placing a first side of the screen adjacent a grate;
placing a retainer adjacent an opposite side of the screen, the retainer including,
an outer ring,
an inner ring,
a plurality of wedges disposed about the outer ring and the inner ring, and
a plurality of keyholes at spaced locations about the outer ring and the inner ring; and

releasably clamping the screen between the grate and the retainer, wherein releasably clamping the screen includes,
extending a plurality of lugs through the screen and the plurality of keyholes of the retainer during the placing of the screen and the retainer, and
rotating the retainer until the plurality of lugs simultaneously engage the plurality of wedges,

wherein the screen is clamped between the retainer and the grate when the plurality of lugs are engaged, and
wherein the screen and the retainer are removable from the grate upon simultaneous disengagement of the plurality of lugs from the plurality of wedges by counter rotation of the retainer.