US2853518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process
Assignee: EIDP Inc
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Filing: 1956-07-30
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Granted: 1958-09-23
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Expires: 1976-07-30
Abstract
No abstract record available.
Inventors
- 👤 Walter J Balon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:30
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6568; C07F9/65683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN THE PROCESS FOR PREPARING ORGANIC CARBODIIMIDES FROM ORGANIC ISOCYANATES HAVING NO ACTIVE HYDROGENCONTAINING SUBSTITUENTS WHICH ARE REACTIVE WITH AN ISOCYANATE GROUP, THE STEP COMPRISING TREATING SAID ORGANIC ISOCYANATE WITH FROM ABOUT 0.4 TO 5.0 PARTS BY WEIGHT OF A PHOSPHORUS COMPOUND PER 100 PARTS BY WEIGHT OF SAID ISOCYANATE, SAID PHOSPHORUS COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A SUBSTITUTED PHOSPHOLINE HAVING THE FORMULA
Claim 2
Dependent Claim
66 words
IN THE PROCESS FOR PREPARING ORGANIC CARBODIIMIDES FROM ORGANIC ISOCYANATES HAVING NO ACTIVE HYDROGENCONTAINING SUBSTITUENTS WHICH ARE REACTIVE WITH AN ISOCYANATE GROUP, THE STEP COMPRISING TREATING SAID ORGANIC ISOCYANATE WITH FROM ABOUT 0.4 TO 5.0 PARTS BY WEIGHT OF A PHOSPHORUS COMPOUND PER 100 PARTS BY WEIGHT OF SAID ISOCYANATE, SAID PHOSPHORUS COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A SUBSTITUTED PHOSPHOLINE HAVING THE 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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |