-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 G1WfTVlbdeLbP4zqvWvtZntOGD2NQr9gCBq7zBoxL67moJFb3U831M2jbW9xgfEw
 rocDE6g5WKFPJrf84tcFfg==

<SEC-DOCUMENT>0000796505-04-000001.txt : 20040408
<SEC-HEADER>0000796505-04-000001.hdr.sgml : 20040408
<ACCEPTANCE-DATETIME>20040408154753
ACCESSION NUMBER:		0000796505-04-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040218
FILED AS OF DATE:		20040408

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ZUCKERMAN STEPHEN L
		CENTRAL INDEX KEY:			0001182968

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-16106
		FILM NUMBER:		04724940

	BUSINESS ADDRESS:	
		STREET 1:		2828 KENWOOD ISLES DRIVE
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55408

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			APA OPTICS INC /MN/
		CENTRAL INDEX KEY:			0000796505
		STANDARD INDUSTRIAL CLASSIFICATION:	OPTICAL INSTRUMENTS & LENSES [3827]
		IRS NUMBER:				411347235
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		2950 NE 84TH LANE
		CITY:			BLAINE
		STATE:			MN
		ZIP:			55434
		BUSINESS PHONE:		6127844995

	MAIL ADDRESS:	
		STREET 1:		2950 NE 84TH LN
		CITY:			BLAINE
		STATE:			MN
		ZIP:			55449
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-02-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000796505</issuerCik>
        <issuerName>APA OPTICS INC /MN/</issuerName>
        <issuerTradingSymbol>APAT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001182968</rptOwnerCik>
            <rptOwnerName>ZUCKERMAN STEPHEN L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-02-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.81</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Spouse</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <remarks>Dr. Zuckerman is reporting purchase by spouse and is claimimg no direct beneficial ownership interest in these shares.</remarks>

    <ownerSignature>
        <signatureName>Stephen L. Zuckerman MD</signatureName>
        <signatureDate>2004-04-08</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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