It depends on the type of material. Books have notifications on their copyright pages; movies include notifications in the credits; fine art may not be marked at all.
There are a few websites one can use to find a copyright attorney. 'Find Law' allows one to search for copyright attorney's by state. 'Contact Law' provides a similar service in the UK.
The copyright page of a book is typically on the reverse of the title page.
The reverse of the title page should have all of the copyright information.
Copyright is automatic, so it will be the date the image was created.
The copyright and catalog-in-publication data should be on the reverse of the title page.
If the patterns are under copyright then you need the permission of the copyright holder to sell them.
Notification will be on the copyright page, which is generally the reverse of the title page.
There are three ways to search US copyright records, online (see link below), in person, or you can have the records searched by copyright office personnel.
The copyright office in your country should make them available online. The Berne Convention is linked below.
The copyright page is generally on the reverse of the title page rather than on the back of the book. It includes copyright and printing information.
The only way of knowing would be to ask the copyright holder. There is no public record.
The copyright office in your country should make them available online. The Berne Convention is linked below.