US2734043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of polypyrrolidone
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:37
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08J2377/00; C08J2377/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A COMPOSITION OF MATTER COMPRISING POLYPYRROLIDONE DISSOLVED IN AT LEAST SUBSTANTIALLY ANHYDROUS FORMIC ACID, SAID COMPOSITION CONTAINING, BY WEIGHT, NOT MORE THAN THREE PARTS OF FORMIC ACID PER PART OF POLYPYRROLIDONE AND BEING DILUTED WITH A NON-SOLVENT FOR THE POLYPYRROLIDONE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC ACIDS HAVING 2 TO 4 CARBON ATOMS AND CHLOROALIPHATIC ACIDS HAVING FROM 2 TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
64 words
A COMPOSITION OF MATTER COMPRISING POLYPYRROLIDONE DISSOLVED IN AT LEAST SUBSTANTIALLY ANHYDROUS FORMIC ACID, SAID COMPOSITION CONTAINING, BY WEIGHT, NOT MORE THAN THREE PARTS OF FORMIC ACID PER PART OF POLYPYRROLIDONE AND BEING DILUTED WITH A NON-SOLVENT FOR THE POLYPYRROLIDONE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC ACIDS HAVING 2 TO 4 CARBON ATOMS AND CHLOROALIPHATIC ACIDS HAVING FROM 2 TO 4 CARBON ATOMS.
References Cited (Backward Citations)
US2638463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |