US2446803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of heterocyclic bases
Assignee: F Hoffmann La Roche AG
•
Filing: 1944-01-15
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Granted: 1948-08-10
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Expires: 1964-01-15
Abstract
No abstract record available.
Inventors
- 👤 Bergel Franz
- 👤 Morrison Alexander Lang
- 👤 Rinderknecht Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/60; C07D207/00; C07D207/02; C07D207/04; C07D207/10; C07D207/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1714180A
Cited
US1672253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |