Patent FR2135022B2 successfully refreshed from Google Patents.
US2643232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric diguanides
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1950-08-14
•
Granted: 1953-06-23
•
Expires: 1970-08-14
Abstract
No abstract record available.
Inventors
- 👤 Rose Francis Leslie
- 👤 Swain Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:51
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
PROCESS FOR THE MANUFACTURE OF THE POLYMERIC SUBSTANCES WHICH IN THE FORM OF THEIR FREE BASES ARE LINEAR POLYMERIC SUBSTANCES IN WHICH THE RECURRING UNIT IS REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US2325586A
Cited
US2474909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |