US3906033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxalic acid diarylamides
Assignee: Novartis AG
•
Filing: 1972-12-18
•
Granted: 1975-09-16
•
Expires: 1992-12-18
Abstract
Abstract Disclosed are oxalic acid diarylamides as ultraviolet absorbing agents for organic materials, the oxalic acid diarylamides being compounds of the formula
Inventors
- 👤 Hans Rudolf Biland
- 👤 Max Duennenberger
- 👤 Christian Luethi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/20; C09K15/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
8 words
A SYMMETRICAL OXALIC ACID DIARYLAMDE OF THE FORMULA
Claim 2
Dependent Claim
8 words
A SYMMETRICAL OXALIC ACID DIARYLAMDE OF THE FORMULA
Claim 3
Dependent Claim
15 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 which corresponds to the formula
Claim 4
Dependent Claim
14 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 and of the formula
Claim 5
Dependent Claim
14 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 and of the formula
Claim 6
Dependent Claim
14 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 and of the formula
Claim 7
Dependent Claim
14 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 and of the formula
Claim 8
Dependent Claim
14 words
A symmetrical oxalic acid diarylamide as claimed in claim 1 and of the formula
Claim 9
Dependent Claim
8 words
A symmetrical oxalic acid diarylamide of the formula
Claim 10
Dependent Claim
8 words
A symmetrical oxalic acid diarylamide of the formula
Claim 11
Dependent Claim
8 words
A symmetrical oxalic acid diarylamide of the formula
Claim 12
Dependent Claim
8 words
A symmetrical oxalic acid diarylamide of the formula
References Cited (Backward Citations)
FR1332227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |