US3371714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rducing the pressure on aqueous solutions of polymers
Assignee: Dow Chemical Co
•
Filing: 1965-03-25
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Granted: 1968-03-05
•
Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 Mcivin F Katzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:00
CPC Classifications
C; C08; C08J; C08J3/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0318
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD FOR SIGNIFICANTLY REDUCING THE PRESSURE ON A SOLUTION OF A HIGH MOLECULAR WEIGHT, ESSENTIALLY LINEAR POLYMER WITH MIMIMAL MOLECULAR DEGRADATION OF THE POLYMER WHICH COMPRISES FLOWING THE POLYMER SOLUTION UNDER PRESSURE THROUGH A POROUS-BED CONTAINED WITHIN A CONDUIT, SAID POROUS-BED BEIGN INSOLUBLE IN, AND PERMEABLE TO, THE POLYMER SOLUTION TO ACHIEVE THE DESIRED PRESSURE REDUCTION.
Claim 2
Independent Claim
57 words
A METHOD FOR SIGNIFICANTLY REDUCING THE PRESSURE ON A SOLUTION OF A HIGH MOLECULAR WEIGHT, ESSENTIALLY LINEAR POLYMER WITH MIMIMAL MOLECULAR DEGRADATION OF THE POLYMER WHICH COMPRISES FLOWING THE POLYMER SOLUTION UNDER PRESSURE THROUGH A POROUS-BED CONTAINED WITHIN A CONDUIT, SAID POROUS-BED BEIGN INSOLUBLE IN, AND PERMEABLE TO, THE POLYMER SOLUTION TO ACHIEVE THE DESIRED PRESSURE REDUCTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |