US3542573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of oxalic acid diarylamides as light filters
Assignee: BASF Schweiz AG
•
Filing: 1966-12-06
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Granted: 1970-11-24
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Expires: 1986-12-06
Abstract
No abstract record available.
Inventors
- 👤 Hans Rudolf Biland
- 👤 Max Duennenberger
- 👤 Christian Luethi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:09
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/418; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/42; A61Q; A61Q17/00; A61Q17/04; C; 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)
US3211562A
Cited
US3340225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |