Patent ID: 11868041
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A method of using a pellicle, the method comprising:
releasing a vacuum between the pellicle and a mask; wherein releasing the vacuum comprises:
releasing the vacuum using a check valve extending through a frame of the pellicle, and
breaking a seal formed using only a single gasket provided in a recess in the frame, wherein the gasket directly contacts the mask, and breaking the seal is free of removing an adhesive from each of the pellicle and the mask;

detaching the entirety of the pellicle from the mask;
mounting the mask in a scanner; and
performing a photolithography process, using the scanner, to transfer the pattern on the mask to a wafer.