THERMO OPTEK CORP

No description available

Certification of termination of registration of a class of securities (Section 12(b))

Annual report pursuant to Section 13 or 15(d) (amendment)

No description available

No description available

Annual report pursuant to Section 13 or 15(d)

No description available

5,7

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

General form for quarterly reports under Section 13 or 15(d)

Registration of Securities on Exchange (amendment)

General form for quarterly reports under Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

5,7

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

5

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Post-effective amendment to a registration statement

Annual report pursuant to Section 13 or 15(d)

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

General form for quarterly reports under Section 13 or 15(d)

1

Current report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

5

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

Post-effective amendment to a registration statement

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Post-effective amendment to a registration statement

Annual report pursuant to Section 13 or 15(d) (amendment)

Annual report pursuant to Section 13 or 15(d)

Withdrawal of a registration statement

Registration statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d) (amendment)

Registration (IPO) statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

Beneficial ownership report for a holder of more than 5% (Schedule 13D)

Prospectus filed under Rule 424(b)(1)

Amended Initial Registration Statement

Registration of Securities on Exchange

Amended Initial Registration Statement