US2782183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer separation method for calcium polyacrylates
Assignee: Monsanto Chemicals Ltd
•
Filing: 1952-08-08
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Granted: 1957-02-19
•
Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Reginald N Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF PREPARING A SOLID PULVERLENT CALCIUM SALT OF A HYDROLYZED ACRYLONITRILE POLYMER HAVING FROM 66 TO 74 PERCENT TO ORIGINAL CYANO NITROGEN CONTENT CONVERTED TO AND EVOLVED AS AMMONIA, WHICH COMPRISES PRECIPITATING THE SAID CALCIUM SALT AT A TEMPERATURE ABOVE 75*C. TO FORM A SUSPENSION IN A MEDIUM SUBSTANTIALLY ENTIRELY COMPRISED OF WATER, FILTERING THE RESULTING SUSPENDSION WHILE MAINTAINING THE TEMPERATURE ABOVE75*C., AND DRYING THE PRECIPITATE AT A TEMPERATURE ABOVE 75*C.
Claim 2
Independent Claim
73 words
A METHOD OF PREPARING A SOLID PULVERLENT CALCIUM SALT OF A HYDROLYZED ACRYLONITRILE POLYMER HAVING FROM 66 TO 74 PERCENT TO ORIGINAL CYANO NITROGEN CONTENT CONVERTED TO AND EVOLVED AS AMMONIA, WHICH COMPRISES PRECIPITATING THE SAID CALCIUM SALT AT A TEMPERATURE ABOVE 75*C. TO FORM A SUSPENSION IN A MEDIUM SUBSTANTIALLY ENTIRELY COMPRISED OF WATER, FILTERING THE RESULTING SUSPENDSION WHILE MAINTAINING THE TEMPERATURE ABOVE75*C., AND DRYING THE PRECIPITATE AT A TEMPERATURE ABOVE 75*C.
References Cited (Backward Citations)
US1984417A
Cited
US2625529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |