EP0052404A2 — Non-yellowing topical pharmaceutical composition
Assigned to Procter and Gamble Co · Expires 1982-05-26 · 44y expired
What this patent protects
Topical compositions, containing tetracycline, tetracycline salts or tetracycline derivatives, which do not cause skin yellowing, are disclosed. These compositions are formulated such that, upon application to the skin, the tetracycline component recrystallizes in small, irregula…
USPTO Abstract
Topical compositions, containing tetracycline, tetracycline salts or tetracycline derivatives, which do not cause skin yellowing, are disclosed. These compositions are formulated such that, upon application to the skin, the tetracycline component recrystallizes in small, irregular crystals at the skin surface. Preferred compositions are buffered at a pH between about 2.0 and 4, such as by the addition of citric acid. The method of treating skin disorders such as acne, using these compositions is also disclosed.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
Track this patent
Get a daily-checked alert when vulnerability score, expiry, classification, or assignee changes. Email, Slack, or Teams delivery. Pro: 50 watches, Free: 3.