US2746988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isdcyanate-bisulefete al
Assignee: —
•
Filing: —
•
Granted: 1956-05-22
•
Expires: 1973-05-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
THE PRODUCT OBTAINED BY REACTING FORMALDEHYDE WITH THE SOLID ADDITION PRODUCT OF AN ALKALI METAL BISULFITE AND AN ORGANIC ISOCYANATE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC ISOCYANATES IN THE PRESENCE OF WATER AT AN ELEVATED TEMPERATURE AT LEAST ABOUT 70* C.
References Cited (Backward Citations)
US2343920A
Cited
GB565780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |