US3812221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of w-amino-alkane phosphonic and phosphiniccacid derivatives
Assignee: Bayer AG
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Filing: 1971-06-29
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Granted: 1974-05-21
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Expires: 1991-06-29
Abstract
Abstract Preparation of the title derivatives by hydrogenation of a salt of the corresponding omega -cyano-alkane phosphonic or phosphinic acid derivative.
Inventors
- 👤 G Oertel
- 👤 R Schliebs
- 👤 R Braden
- 👤 U Hendricks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:08
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/301; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |