US3892844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting the skin from ultraviolet radiation
Assignee: F Hoffmann La Roche AG
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Filing: 1972-07-20
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Granted: 1975-07-01
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Expires: 1992-07-20
Abstract
Abstract Radiation screening preparations comprising a substance selected from the group consisting of cytosine, uracil, guanine 5chlorouracil and mixtures thereof are described. Synergistic combinations of these substances and conventional radiation screening materials are also described.
Inventors
- 👤 Gustav Erlemann
- 👤 Dr Hellmut Ippen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:41
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/04; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/494; A61K8/4953; A61K8/60; A61K8/606; H; H05; H05K; H05K3/00; H05K3/30; H05K3/303; H05K3/305
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A METHOD OF PROTECTING SKIN FROM ERYTHEMA INDUCING ULTRAVIOLET RADIATION WHICH COMPRISES APPLYING TO THE SKIN AN EFFECTIVE AMOUNT OF A SUNSCREEN COMPOSITION COMPRISING FROM ABOUT 1% BY WEIGHT TO ABOUT 30% BY WEIGHT OF AN ACTIVE INGREDIENT COMPRISING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CYTOSINE, URACIL, GUANINE, 5-CHOROURACIL AND MIXTURES THEREOF, AND AN INERT, DERMATOLOGICALLY ACCEPTABLE CARRIER MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN OINTMENT, A CREAM, A MILK, A LOTION AND AN AEROSOL.
Claim 2
Independent Claim
78 words
A METHOD OF PROTECTING SKIN FROM ERYTHEMA INDUCING ULTRAVIOLET RADIATION WHICH COMPRISES APPLYING TO THE SKIN AN EFFECTIVE AMOUNT OF A SUNSCREEN COMPOSITION COMPRISING FROM ABOUT 1% BY WEIGHT TO ABOUT 30% BY WEIGHT OF AN ACTIVE INGREDIENT COMPRISING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CYTOSINE, URACIL, GUANINE, 5-CHOROURACIL AND MIXTURES THEREOF, AND AN INERT, DERMATOLOGICALLY ACCEPTABLE CARRIER MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN OINTMENT, A CREAM, A MILK, A LOTION AND AN AEROSOL.
Claim 3
Dependent Claim
23 words
A method in accordance with claim 1 wherein said active ingredient comprises from about 2% to about 5% by weight of said composition.
Claim 4
Dependent Claim
22 words
A method in accordance with claim 1 wherein said carrier material is a milk and the active ingredient is in micronized form.
Claim 5
Independent Claim
114 words
A method of protecting skin from erythema inducing ultraviolet radiation which comprises applying to the skin an effective amount of a sun-screen composition comprising an inert dermatologically acceptable carrier material selected from the group consisting of an ointment, a cream, a milk a lotion and an aerosol and an active ingredient consisting essentially of a combination of: a. from about 1% to about 30% by weight based on said composition of a compound selected from the group consisting of cytosine, uracil, guanine, 5-chlorouracil and mixtures thereof: and b. from about 1% to about 20% by weight based on said composition of a sunscreen agent characterized by a maximum light absorption between 2900A and 3200A.
Claim 6
Independent Claim
114 words
A method of protecting skin from erythema inducing ultraviolet radiation which comprises applying to the skin an effective amount of a sun-screen composition comprising an inert dermatologically acceptable carrier material selected from the group consisting of an ointment, a cream, a milk a lotion and an aerosol and an active ingredient consisting essentially of a combination of: a. from about 1% to about 30% by weight based on said composition of a compound selected from the group consisting of cytosine, uracil, guanine, 5-chlorouracil and mixtures thereof: and b. from about 1% to about 20% by weight based on said composition of a sunscreen agent characterized by a maximum light absorption between 2900A and 3200A.
References Cited (Backward Citations)
US3448190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |