US2490573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of phosphorus compounds
Assignee: F Hoffmann La Roche AG
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Filing: 1947-03-14
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Granted: 1949-12-06
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Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
- 👤 Atherton Frank Ratcliffe
- 👤 Bergel Franz
- 👤 Cohen Aaron
- 👤 Haworth John Wynne
- 👤 Openshaw Harry Tacon
- 👤 Todd Alexander Robertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:17
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/22; C07F9/24; C07F9/2454; C07F9/247
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) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |