US3249625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing nu-vinyl pyrrolidone-2
Assignee: Hoechst AG
•
Filing: 1962-09-18
•
Granted: 1966-05-03
•
Expires: 1982-09-18
Abstract
No abstract record available.
Inventors
- 👤 Bestian Herbert
- 👤 Hartwimmer Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:40
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D211/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF N-VINYL PYRROLIDONE WHICH COMPRISES REACTING ACETYLENE WITH PYRROLIDONE-2 IN A REACTION ZONE IN THE GASEOUS PHASE AT AN ELEVATED TEMPERATURE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL STANNATES, ALKALI METAL ZINCATES, ALKALI METAL ALUMINATES, ALKALI METAL BERYLLATES, ALKALI METAL VANADATES, ALKKALI METAL ANTIMONATES, ALKALI METAL TITANATES, ALKALI METAL ZIRCONATES, ALKALI METAL MOLYBDATES, ALKALI METAL TUNGSTATES, ALKALI METAL MANGANITES, ALKALI METAL LANTHANUM OXIDES, ALKALI METAL BISMUTH OXIDES, ALKALI METAL IRON OXIDES, ALKALI METAL CADMIUM OXIDES, AND ALKALI METAL MERCURY OXIDES.
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF N-VINYL PYRROLIDONE WHICH COMPRISES REACTING ACETYLENE WITH PYRROLIDONE-2 IN A REACTION ZONE IN THE GASEOUS PHASE AT AN ELEVATED TEMPERATURE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL STANNATES, ALKALI METAL ZINCATES, ALKALI METAL ALUMINATES, ALKALI METAL BERYLLATES, ALKALI METAL VANADATES, ALKKALI METAL ANTIMONATES, ALKALI METAL TITANATES, ALKALI METAL ZIRCONATES, ALKALI METAL MOLYBDATES, ALKALI METAL TUNGSTATES, ALKALI METAL MANGANITES, ALKALI METAL LANTHANUM OXIDES, ALKALI METAL BISMUTH OXIDES, ALKALI METAL IRON OXIDES, ALKALI METAL CADMIUM OXIDES, AND ALKALI METAL MERCURY OXIDES.
References Cited (Backward Citations)
US2806847A
Cited
US2806848A
Cited
US2317804A
Cited
US2669570A
Cited
US2775599A
Cited
GB799924A
Cited
GB846575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |