Revoke alter permissions on service account I had run the following statements to grant alter permissions on specific tables for the service account 

ALTER AUTHORIZATION ON [PartyMsci] TO  "INT\svc-w-corerefdata-de";
ALTER AUTHORIZATION ON [Product] TO  "INT\svc-w-corerefdata-de";
ALTER AUTHORIZATION ON [SimpleIndustryPICS8] TO  "INT\svc-w-corerefdata-de";


How do I remove these permissions ?
You should be able to reset the ownership of the object by executing the following:

ALTER AUTHORIZATION ON PartyMsci TO SCHEMA OWNER;
ALTER AUTHORIZATION ON Product TO SCHEMA OWNER;
ALTER AUTHORIZATION ON SimpleIndustryPICS8 TO SCHEMA OWNER;


You can determine who the current owner is for objects in the database using this query:

SELECT ObjectName = o.name
    , ObjectOwner = CASE WHEN dp.name IS NOT NULL THEN dp.name ELSE so.name END
FROM sys.objects o
    LEFT JOIN sys.database_principals dp ON o.principal_id = dp.principal_id
    LEFT JOIN sys.schemas s ON o.schema_id = s.schema_id
    LEFT JOIN sys.database_principals so ON s.principal_id = so.principal_id
ORDER BY o.name;


The Microsoft Docs on ALTER AUTHORIZATION makes this note:


  If the target entity is not a database and the entity is being transferred to a new owner, all permissions on the target will be dropped. 


As a result, you should analyze the required permissions on those objects before you change the owner via ALTER AUTHORIZATION, and re-apply appropriate permissions once you have changed the owner.