Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Johnson David Allen
 2. Date of Event Requiring Statement (Month/Day/Year)
07/26/2012		 3. Issuer Name and Ticker or Trading Symbol
STERIS CORP [STE]
(Last)
(First)
(Middle)
5960 HEISLEY ROAD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr. VP. Global Ops & Quality
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

MENTOR, OH 44060		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Shares, No Par Value 13,900 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Shares   (2) 05/20/2020 Common Shares, No Par Value 7,500 $ 31.87 D  
Option to Purchase Common Shares   (3) 05/31/2021 Common Shares, No Par Value 11,000 $ 36.09 D  
Option to Purchase Common Shares   (4) 05/30/2022 Common Shares, No Par Value 10,000 $ 29.94 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Johnson David Allen
5960 HEISLEY ROAD
MENTOR, OH 44060		       Sr. VP. Global Ops & Quality  

Signatures

/s/ Dennis P. Patton, Authorized Representative under Power of Attorney 08/02/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) All 13,900 of these Common Shares are restricted. The restrictions on these Common Shares lapse as follows: 4,000 on April 26, 2013, 2,700 on May 20, 2014, 3,700 on June 1, 2015 and 3,500 on May 31, 2016.
(2) These options became or will become exercisable as follows: 1,875 on May 20, 2011, 1,875 on May 20, 2012, 1,875 on May 20, 2013 and 1,875 on May 20, 2014.
(3) These options became or will become exercisable as follows: 2,750 on May 31, 2012, 2,750 on May 31, 2013, 2,750 on May 31, 2014 and 2,750 on May 31, 2015.
(4) These options become exercisable as follows: 2,500 on May 30, 2013, 2,500 on May 30, 2014, 2,500 on May 30, 2015 and 2,500 on May 30, 2016.

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