US3072587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized methylolated polyacrylamide aqueous solutions and process for preparing same
Assignee: Oxford Paper Co
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Filing: 1960-11-21
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Granted: 1963-01-08
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Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Glenn H Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:57
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS OF PREPARING STABILIZED AQUEOUS SOLUTIONS OF METHYLOLATED POLYACRYLAMIDE WHICH COMPRISES REACTING A POLYACRYLAMIDE WITH A METHYLOLATING AGENT CONTAINING FORMALDEHYDE AND TRIS (HYDROXYMETHYL) NITRO METHANE IN AN AQUEOUS MEDIUM AT AN ALKALINE PH TO FORM A METHYLOLATED POLYACRYLAMIDE CHARACTERIZEDBY ITS STABILITY WITHIN A PH RANGE OF BETWEEN ABOUT 5 AND 7.
Claim 2
Dependent Claim
52 words
THE PROCESS OF PREPARING STABILIZED AQUEOUS SOLUTIONS OF METHYLOLATED POLYACRYLAMIDE WHICH COMPRISES REACTING A POLYACRYLAMIDE WITH A METHYLOLATING AGENT CONTAINING FORMALDEHYDE AND TRIS (HYDROXYMETHYL) NITRO METHANE IN AN AQUEOUS MEDIUM AT AN ALKALINE PH TO FORM A METHYLOLATED POLYACRYLAMIDE CHARACTERIZEDBY ITS STABILITY WITHIN A PH RANGE OF BETWEEN ABOUT 5 AND 7.
References Cited (Backward Citations)
US2484315A
Cited
US2808383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |