US2999852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing polymeric pyrrolidones and piperidones from adhering to polymerization vessels in which they are prepared
Assignee: GAF Chemicals Corp
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Filing: 1958-12-04
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Granted: 1961-09-12
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Expires: 1978-12-04
Abstract
No abstract record available.
Inventors
- 👤 Edgar E Renfrew
- 👤 Saul R Buc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:00
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD OF PREVENTING POLYMERIC PYRROLIDONES AND PIPERIDONES FROM ADHERING TO POLYMERIZATION EQUIPMENT IN WHICH THEY ARE PREPARED COMPRISING CLEANING THE INTERIOR SURFACES OF SAID EQUIPMENT AND DRYING SAID INTERIOR SURFACES, WETTING THE CLEANED AND DRIED INTERIOR SURFACES OF SAID EQUIPMENT, PRIOR TO POLYMERIZATION, WITH A SOLUTION CONTAINING 0.5 TO 10 PARTS BY WEIGHT OF AN ALKYLTRICHLOROSILANE OF 10 TO 24 CARBON ATOMS, FOLLOWED BY EXPOSING THE TREATED SURFACE TO AN AQUEOUS FLUID CONTAINING 1% BY WEIGHT OF A NON-IONIC ALKYL PHENOL-ETHYLENE OXIDE SURFACTANT AND DRYING THE SAME AND THEREAFTER POLYMERIZING THE CORRESPONDING MONOMERS OF SAID PYRROLIDONES AND PIPERIDONES IN THE DRIED EQUIPMENT AND RECOVERING THE POLYMER THEREFROM.
Claim 2
Independent Claim
108 words
THE METHOD OF PREVENTING POLYMERIC PYRROLIDONES AND PIPERIDONES FROM ADHERING TO POLYMERIZATION EQUIPMENT IN WHICH THEY ARE PREPARED COMPRISING CLEANING THE INTERIOR SURFACES OF SAID EQUIPMENT AND DRYING SAID INTERIOR SURFACES, WETTING THE CLEANED AND DRIED INTERIOR SURFACES OF SAID EQUIPMENT, PRIOR TO POLYMERIZATION, WITH A SOLUTION CONTAINING 0.5 TO 10 PARTS BY WEIGHT OF AN ALKYLTRICHLOROSILANE OF 10 TO 24 CARBON ATOMS, FOLLOWED BY EXPOSING THE TREATED SURFACE TO AN AQUEOUS FLUID CONTAINING 1% BY WEIGHT OF A NON-IONIC ALKYL PHENOL-ETHYLENE OXIDE SURFACTANT AND DRYING THE SAME AND THEREAFTER POLYMERIZING THE CORRESPONDING MONOMERS OF SAID PYRROLIDONES AND PIPERIDONES IN THE DRIED EQUIPMENT AND RECOVERING THE POLYMER THEREFROM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |