US3331798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscous aqueous blend of polystyrene sulfonate and n-vinylpyrrolidinone, and preparation thereof
Assignee: Dow Chemical Co
•
Filing: 1962-01-08
•
Granted: 1967-07-18
•
Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Billy B Hibbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:53
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
COMPOSITION OF MATTER COMPRISING CONCENTRATED SULFURIC ACID, SODIUM POLYSTYRENE SULFONATE, AND A POLYMER COMPRISING RECURRING N-VINYLPYRROLIDINONE MOIETIES TOGETHER WITH A MINOR CONTENT OF WATER, SUCH COMPOSITION BEING CHARACTERIZED BY HAVING A VISCOSITY GREATER THAN THE VISCOSITY OF ANY OF ITS STARTING MATERIALS.
Claim 2
Dependent Claim
42 words
COMPOSITION OF MATTER COMPRISING CONCENTRATED SULFURIC ACID, SODIUM POLYSTYRENE SULFONATE, AND A POLYMER COMPRISING RECURRING N-VINYLPYRROLIDINONE MOIETIES TOGETHER WITH A MINOR CONTENT OF WATER, SUCH COMPOSITION BEING CHARACTERIZED BY HAVING A VISCOSITY GREATER THAN THE VISCOSITY OF ANY OF ITS STARTING MATERIALS.
References Cited (Backward Citations)
US2558167A
Cited
US2723248A
Cited
US2901457A
Cited
GB836831A
Cited
US2961431A
Cited
US3048550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |