US2643250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate dimers as color forming intermediates
Assignee: EIDP Inc
•
Filing: 1951-11-16
•
Granted: 1953-06-23
•
Expires: 1971-11-16
Abstract
No abstract record available.
Inventors
- 👤 Stallmann Otto
- 👤 Esley O Langerak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:48
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C07; C07D; C07D229/00; C07D273/00; C09B43/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE COMPOUNDS OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
THE COMPOUNDS OF THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
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 |