US2888440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane diamines
Assignee: EIDP Inc
•
Filing: 1957-08-16
•
Granted: 1959-05-26
•
Expires: 1977-08-16
Abstract
No abstract record available.
Inventors
- 👤 August H Frazer
- 👤 Earl J Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
C; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A POLYURETHANE DIAMINE HAVING A MOLECULAR WEIGHT OF FROM ABOUT 990 TO ABOUT 6000 AND HAVING THE FORMULA
Claim 2
Dependent Claim
18 words
A POLYURETHANE DIAMINE HAVING A MOLECULAR WEIGHT OF FROM ABOUT 990 TO ABOUT 6000 AND HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |