US3529982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for protecting organic material from the action of ultraviolet rays
Assignee: BASF Schweiz AG
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Filing: 1967-02-06
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Granted: 1970-09-22
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Expires: 1987-02-06
Abstract
Abstract This invention refers to a process for protecting organic materials that can be damaged by ultraviolet rays, from the action of ultraviolet rays, wherein asymmetrical oxalic acid diarylamides of the general formula A-NH-CO-CO-NH-B where A and B are different from each other and each represents a benzene or naphthalene residue, these residues A and B (a) being free from hydroxyl groups in the ortho-positions to the amide nitrogen atom and (b) containing if desired substituents that contain no more than 20 carbon atoms and do not displace the absorption maximum of the compound towards values above 400 m mu , are applied to said materials, as well as compositions containing said oxalic acid diarylamides.
Inventors
- 👤 Christian Luethi
- 👤 Max Duennenberger
- 👤 Hans Rudolf Biland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/42; A61Q; A61Q17/00; A61Q17/04; C; C07; C07C; C07C233/00; C07C233/01; C07C233/16; C08; C08K; C08K5/00; C08K5/16; C08K5/20; C09; C09K; C09K15/00; C09K15/04; C09K15/20; C09K15/22
Claims Analysis
Total Claims: 0
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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) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |