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US006464560B2

(12) United States Patent

Sandhu et al.

(io) Patent No.: US 6,464,560 B2 (45) Date of Patent: Oct. 15,2002

(54) SYSTEM FOR REAL-TIME CONTROL OF SEMICONDUCTOR WAFER POLISHING

(75) Inventors: Gurtej S. Sandhu; Trung Tri Doan,

both of Boise, ID (US)

(73) Assignee: Micron Technology, Inc., Boise, ID (US)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/898,384

(22) Filed: Jul. 3, 2001

(65) Prior Publication Data

US 2001/0041501 Al Nov. 15, 2001

Related U.S. Application Data

(60) Division of application No. 09/752,217, filed on Dec. 28, 2000, now Pat. No. 6,338,667, which is a division of application No. 09/501,735, filed on Feb. 11, 2000, now Pat. No. 6,261,151, which is a division of application No. 09/181,433, filed on Oct. 28, 1998, now Pat. No. 6,120,347, which is a continuation of application No. 08/907,389, filed on Aug. 7, 1997, now Pat. No. 5,851,135, which is a continuation of application No. 08/547,529, filed on Oct. 24, 1995, now Pat. No. 5,700,180, which is a continuation-inpart of application No. 08/112,759, filed on Aug. 25, 1993, now Pat. No. 5,486,129.

(51) Int. CI.7 B24B 49/00; B24B 51/00

(52) U.S. CI 451/5; 451/7; 451/8; 451/9

(58) Field of Search 451/5, 8, 9, 10,

451/53, 7, 286-290, 449

(56) References Cited

U.S. PATENT DOCUMENTS

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