Patent US3073843A successfully refreshed from Google Patents.
US3073843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n-hydroxymethyl pyrrolidone
Assignee: GAF Chemicals Corp
•
Filing: 1960-12-16
•
Granted: 1963-01-15
•
Expires: 1980-12-16
Abstract
No abstract record available.
Inventors
- 👤 Dolores M Buc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:41
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF MAKING N-HYDROMETHYL PYRROLIDONE BY REACTING IN THE ABSENCE OF AN AQUEOUS MEDIUM AND IN THE PRESENCE OF A STRONG ALKALINE CATALYST SELECTED FROM THE GROUP CONSISTING OF THE HYDROXIDES AND CARBONATES OF THE ALKALI METALS, PYRROLIDONE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND THOSE COMPOUNDS WHICH LIBERATE FORMALDEHYDE UNDER THE REACTION CONDITIONS.
Claim 2
Independent Claim
59 words
THE METHOD OF MAKING N-HYDROMETHYL PYRROLIDONE BY REACTING IN THE ABSENCE OF AN AQUEOUS MEDIUM AND IN THE PRESENCE OF A STRONG ALKALINE CATALYST SELECTED FROM THE GROUP CONSISTING OF THE HYDROXIDES AND CARBONATES OF THE ALKALI METALS, PYRROLIDONE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND THOSE COMPOUNDS WHICH LIBERATE FORMALDEHYDE UNDER THE REACTION CONDITIONS.
References Cited (Backward Citations)
US2526517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |