US3796749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing amino methylene phosphonic acids
Assignee: Individual
•
Filing: 1972-05-19
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Granted: 1974-03-12
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Expires: 1992-05-19
Abstract
Abstract THE IMPROVED PROCESS OF PRODUCING SUBSTANTIALLY PURE AMINO METHYLENE PHOSPHONIC AICDS IN A HIGH YIELD COMPRISES REACTING N-SUBSTITUTED A-AMINO MONO- OR POLYCARBOXYLIC ACIDS OR THEIR ALKALI METAL SALTS WITH PHOSPHOROUS ACID IN THE PRESENCE OF WATER-BINDING AGENTS AT A TEMPERATURE BETWEEN ABOUT 90*C. AND ABOUT 160*C.
Inventors
- 👤 F Krueger
- 👤 L Bauer
- 👤 W Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3817
Claims Analysis
Total Claims: 0
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |