US2764590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain 4, 4'-disubstituted-diphenylpyridyl methanes and process
Assignee: Boehringer Ingelheim Pharma GmbH and Co KG
•
Filing: 1953-03-16
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Granted: 1956-09-25
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Expires: 1973-03-16
Abstract
No abstract record available.
Inventors
- 👤 Kottler August
- 👤 Seeger Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:51
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/28; C07D213/30; C07D213/36; C07D213/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
AS NEW PRODUCTS 4,4''-DISUBSTITUTED-DIPHENYL-PYRIDYLMETHANES HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
9 words
AS NEW PRODUCTS 4,4''-DISUBSTITUTED-DIPHENYL-PYRIDYLMETHANES HAVING THE FOLLOWING STRUCTURAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |