Patent US3069392A successfully refreshed from Google Patents.
US3069392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activators for the polymerization of pyrrolidone
Assignee: Monsanto Chemicals Ltd
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Filing: 1958-04-21
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Granted: 1962-12-18
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Expires: 1978-04-21
Abstract
No abstract record available.
Inventors
- 👤 Howard G Clark
- 👤 William B Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR POLYMERIZING 2-PYRROLIDONE WHICH COMPRISES FORMING A MIXTURE CONTAINING 2-PYRROLIDONE, A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, PYRROLIDONE SALTS OF ALKALI METALS, HYDRIDES OF ALKALI METALS, ALKYL AND ARYL SALTS OF ALKALI METALS, HYDROXIDES AND OXIDES OF ALKALI METALS, AND A CATALYST ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF NITROGEN DIOXIDE AND ORGANIC NITRITES HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
63 words
A PROCESS FOR POLYMERIZING 2-PYRROLIDONE WHICH COMPRISES FORMING A MIXTURE CONTAINING 2-PYRROLIDONE, A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, PYRROLIDONE SALTS OF ALKALI METALS, HYDRIDES OF ALKALI METALS, ALKYL AND ARYL SALTS OF ALKALI METALS, HYDROXIDES AND OXIDES OF ALKALI METALS, AND A CATALYST ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF NITROGEN DIOXIDE AND ORGANIC NITRITES HAVING THE GENERAL FORMULA:
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) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |