US3090736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insoluble polyacrylic acid salts and method of preparing the same
Assignee: Dow Chemical Co
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Filing: 1960-01-27
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Granted: 1963-05-21
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Expires: 1980-01-27
Abstract
No abstract record available.
Inventors
- 👤 Robert N Bashaw
- 👤 Billy G Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:47
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08J2333/00; C08J2333/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR THE PREPARATION OF WATER INSOLUBLE CROSS-LINKED SALTS OF POLYACRYLIC ACID COMPRISING EXPOSING TO A TOTAL DOSE OF HIGH ENERGY IONIZING RADIATION OF FROM ABOUT 0.001 MEGARAD TO ABOUT 50 MEGARADS AT AN INTENSITY OF AT LEAST 0.27 MEGARAD PER HOUR AN AQUEOUS SYSTEM CONTAINING FRM ABOUT 20 PERCENT TO ABOUT 80 PERCENT BY WEIGHT OF WATER AND CORRESPONDINGLY FROM ABOUT 80 PER CENT TO ABOUT 20 PERCENT BY WEIGHT OF A SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND POLYACRYLIC ACID, SAID SALT BEING A MEMBER OF THE GROUP CONSISTING OF THE ALKALI SALTS, THE ALKALINE EARTH METAL SALTS AND SALTS OF THE ELEMETS MAGNESIUM, TIN, LEAD, NICKEL, ZINC, COBALT, AND CADMIUM.
Claim 2
Dependent Claim
120 words
A PROCESS FOR THE PREPARATION OF WATER INSOLUBLE CROSS-LINKED SALTS OF POLYACRYLIC ACID COMPRISING EXPOSING TO A TOTAL DOSE OF HIGH ENERGY IONIZING RADIATION OF FROM ABOUT 0.001 MEGARAD TO ABOUT 50 MEGARADS AT AN INTENSITY OF AT LEAST 0.27 MEGARAD PER HOUR AN AQUEOUS SYSTEM CONTAINING FRM ABOUT 20 PERCENT TO ABOUT 80 PERCENT BY WEIGHT OF WATER AND CORRESPONDINGLY FROM ABOUT 80 PER CENT TO ABOUT 20 PERCENT BY WEIGHT OF A SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND POLYACRYLIC ACID, SAID SALT BEING A MEMBER OF THE GROUP CONSISTING OF THE ALKALI SALTS, THE ALKALINE EARTH METAL SALTS AND SALTS OF THE ELEMETS MAGNESIUM, TIN, LEAD, NICKEL, ZINC, COBALT, AND CADMIUM.
References Cited (Backward Citations)
GB665263A
Cited
US2964456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |