US3089861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyhydroxy nitriles and their production
Assignee: DEUTSCHE GOLD- und SILBER-SCHEIDEAUSTALT VORMALS ROESSLER
•
Filing: 1961-11-02
•
Granted: 1963-05-14
•
Expires: 1981-11-02
Abstract
No abstract record available.
Inventors
- 👤 Leyerzapf Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:55
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE PRODUCTION OF A POLY-A-HYDROXY NITRILES WHICH COMPRISES REACTING MACROMOLECULAR POLYACROLEIN WITH HYDROGEN CYAMIDE AT A TEMPERATURE BETWEEN 0 AND 100*C. AT A PH BETWEEN 7 AND 10 IN THE PRESENCE OF AN ALKALINE CATALYST.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE PRODUCTION OF A POLY-A-HYDROXY NITRILES WHICH COMPRISES REACTING MACROMOLECULAR POLYACROLEIN WITH HYDROGEN CYAMIDE AT A TEMPERATURE BETWEEN 0 AND 100*C. AT A PH BETWEEN 7 AND 10 IN THE PRESENCE OF AN ALKALINE CATALYST.
References Cited (Backward Citations)
US3047588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |