Self-sterilizing article and its preparation

• US 2,689,809 A
• Filed: 10/08/1951
• Issued: 09/21/1954
• Est. Priority Date: 10/08/1951
• Status: Expired due to Term

• Current Assignee: Frank Fessler
• Original Assignee: Frank Fessler
• Inventors: Fessler, Frank
• Application Number:
  US03/250,386
• Time in Patent Office: 1,079 Days
• US Class Current: 424/404
• CPC Class Codes: D06M 16/00 Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic

Claims

1. THE METHOD FOR TREATING AN ARTICLE TO RENDER IT ANTISEPTIC AND SELF-STERILIZING WHICH INCLUDES THE STEPS OF:

CONTACTING THE ARTICLE WITH A FIRST AQUEOUS SOLUTION COMPRISING A WATER-SOLUBLE SILVER SALT AND A FIRST WATER-SOLUBLE SALT OF A METAL OTHER THAN SILVER;

SUBSEQUENTLY CONTACTING THE THUS TREATED ARTICLE WITH A SECOND AQUEOUS SOLUTION COMPRISING A SECOND WATER-SOLUBLE SALT, THE ANION OF WHICH IS SELECTED FROM THE GROUP CONSISTING OF HALIDES AND PHOSPHATES, AND A THIRD WATERSOLUBLE SALT, THE ANION OF WHICH FORMS A WATERINSOLUBLE COMPOUND WITH THE METAL CATION OF THE FIRST WATER-SOLUBLE SALT, AND A WATER-SOLUBLE BASIC NITROGEN COMPOUND, WHEREBY A WATER-INSOLUBLE SILVER SALT AND A WATER-INSOLUBLE METAL COMPOUND ARE FORMED, SAID METAL COMPOUND FUNCTIONING AS AN EFFECTIVE STABILIZER OF THE SILVER SALT AGAINST THE EFFECT OF LIGHT NORMALLY TENDING TO DISCOLOR SAID SILVER SALT;

AND THEN REMOVING THE BASIC NITROGEN COMPOUND FROM SAID ARTICLE.

14. AN ARITCLE HAVING ON THE SURFACES THEREOF A TIGHTLY ADHERENT COATING COMPRISING A COPRECIPITATED MIXTURE OF A WATER-INSOLUBLE SLIVER SALT SELECTED FROM THE GROUP CONSISTING OF HALIDES AND PHOSPHATES AND AT LEAST ONE OTHER WATERINSOLUBLE COMPOUND OF A METAL OTHER THAN SILVER, SAID METAL COMPOUND FUNCTIONING AS AN EFFECTIVE STABILIZER OF THE SILVER SALT AGAINST THE EFFECT OF LIGHT NORMALLY TENDING TO DISCOLOR SAID SILVER SALT AND SAID ARTICLE BEING CHARACTERIZED BY BEING ANTISEPTIC AND SELF-STERILIZING AFTER REPEATED WASHING IN HOT SOAP SOLUTION AND BY UNDERGOING SUBSTANTIALLY EXPOSURE TO SUNLIGHT.