SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* CASCADE INVESTMENT LLC (Last) (First) (Middle) 2365 CARILLON POINT (Street) KIRKLAND WA 98033 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Patriot Coal CORP [ PCX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner Officer (give title below) X Other (specify below) See Footnote (3)
	3. Date of Earliest Transaction (Month/Day/Year) 01/29/2010
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/29/2010		J(1)		17,421	D	$18.01	2,391,231(2)	D(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* CASCADE INVESTMENT LLC (Last) (First) (Middle) 2365 CARILLON POINT (Street) KIRKLAND WA 98033 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) See Footnote (3)

1. Name and Address of Reporting Person* GATES WILLIAM H III (Last) (First) (Middle) ONE MICROSOFT WAY (Street) REDMOND WA 98052 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director 10% Owner Officer (give title below) X Other (specify below) (1)

Explanation of Responses:

1. The shares were transferred pursuant to a letter agreement (as amended, the "Letter Agreement"), which provided that certain persons including the reporting persons herein would transfer to Mr. Paul Vining shares of Common Stock in an amount determined as set forth in the Letter Agreement. The foregoing discussion of the Letter Agreement is not intended to be a complete statement of all of the material terms thereof and is qualified in its entirety by the Letter Agreement filed as Exhibit 10.1 to Patriot Coal Corporation's quarterly report on Form 10-Q filed on August 7, 2009 (File No. 001-33466).

2. On August 11, 2008, the Common Stock of Patriot Coal Corporation split 2-for-1, resulting in the reporting persons' acquisition of 1,204,326 additional shares of Common Stock.

3. The reporting persons may be deemed to be a member of a group beneficially owning 10% or more of the Common Stock of the issuer within the meaning of Section 13(d) of the Securities Exchange Act of 1934. The reporting persons disclaim beneficial ownership of all securities other than those reported above, and this report shall not be deemed an admission that such a group exists or that the reporting persons are the beneficial owners of the securities of such group for purposes of Section 16 or for any other purpose.

Remarks:

	/s/ Cascade Investment, L.L.C. by Alan Heuberger, Attorney-in-fact for Michael Larson, Business Manager	02/02/2010
	/s/ Alan Heuberger, Attorney-in-fact for William H. Gates III	02/02/2010
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.