US2740761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for the stabilization of substances against the detrimental action of ultra-violet radiation
Assignee: Universal Oil Products Co
•
Filing: 1952-10-11
•
Granted: 1956-04-03
•
Expires: 1972-10-11
Abstract
No abstract record available.
Inventors
- 👤 William K T Gleim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:17
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; A; A23; A23B; A23B4/00; A23B4/10; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4973; A61K8/498; A61Q; A61Q17/00; A61Q17/04; B; B65; B65D; B65D81/00; B65D81/24; B65D81/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
AN ULTRA-VIOLET LIGHT SCREENING COMPOSITION COMPRISING A MIXTURE OF AT LEAST 5% BY WEIGHT OF 4-METHYLCOUMARIN, AT LEAST 20% BY WEIGHT OF 4-METHYL-7-HYDROXYCOUMARIN, AND AT LEAST 25% BY WEIGHT OF 4-METHYL-6,7DIHYDROXYCOUMARIN.
Claim 2
Dependent Claim
31 words
AN ULTRA-VIOLET LIGHT SCREENING COMPOSITION COMPRISING A MIXTURE OF AT LEAST 5% BY WEIGHT OF 4-METHYLCOUMARIN, AT LEAST 20% BY WEIGHT OF 4-METHYL-7-HYDROXYCOUMARIN, AND AT LEAST 25% BY WEIGHT OF 4-METHYL-6,7DIHYDROXYCOUMARIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |