US3663518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing acrylamide polymers
Assignee: ChampionX LLC
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Filing: 1970-07-08
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Granted: 1972-05-16
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Expires: 1990-07-08
Abstract
Abstract MONOMERS SOLUBLE IN POLAR SOLVENTS, E.G., WATER AND/OR METHANOL, CAPABLE OF UNDERGOING POLYMERIZATION EXOTHERMICALLY ARE POLYMERIZED BY: (A) FORMING A SOLUTION OF AT LEAST ONE MONOMER AND A CATALYST, (2) FORMING THE THUS PREPARED SOLUTION INTO THE FORM OF A THIN FILM, (3) HEATING THE FORMED THIN FILM TO A TEMPERATURE SUFFICIENT TO INITIATE POLYMERIZATION AND INITIATING SUCH POLYMERIZATION, AND (4) MAINTAINING THE POLYMERIZATION TEMPERATURE UNTIL THE POLYMERIZATION IS ESSENTIALLY COMPLETED.
Inventors
- 👤 Harold I Patzelt
- 👤 Lawrence J Connelly
- 👤 Edward G Ballweber D Korzenski
- 👤 Kenneth L Slepicka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; Y; Y10; Y10S; Y10S526/00; Y10S526/922
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |