US3236882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carbodiimides
Assignee: Eastman Kodak Co
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Filing: 1962-03-29
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Granted: 1966-02-22
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Burton D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A METHOD OF PREPARING A CARBODIIMIDE WHICH COMPRISES HEATING A SOLUTION OF A THIOURES IN AN INERT LOW BOILING SOLVENT WITH SILVER OXIDE TO A TEMPERATURE OF AT LEAST 25*C. WHEREBY A SUBSTANTIAL AMOUNT OF CARBODIIMIDE IS OBTAINED.
Claim 2
Independent Claim
38 words
A METHOD OF PREPARING A CARBODIIMIDE WHICH COMPRISES HEATING A SOLUTION OF A THIOURES IN AN INERT LOW BOILING SOLVENT WITH SILVER OXIDE TO A TEMPERATURE OF AT LEAST 25*C. WHEREBY A SUBSTANTIAL AMOUNT OF CARBODIIMIDE IS OBTAINED.
Claim 3
Independent Claim
32 words
A METHOD OF PREPARING 1-ETHYL-3-(3-DIMETHYLAMINOPROPYL)CARBODIIMIDE METHO - P - TOUENESULFONATE WHICH COMPRISES REFLUXING A SLURRY OF 1-ETHYL-3-DIMETHYLAMINOPROPYL)THIOUREA METHO-P-TOLUENESULFONATE AND SILVER OXIDE IN ACETONE UNTIL A SUBSTANTIAL CONTENT OF THE CARBODIIMIDE IS OBTAINED.
Claim 4
Independent Claim
32 words
A METHOD OF PREPARING 1-ETHYL-3-(3-DIMETHYLAMINOPROPYL)CARBODIIMIDE METHO - P - TOUENESULFONATE WHICH COMPRISES REFLUXING A SLURRY OF 1-ETHYL-3-DIMETHYLAMINOPROPYL)THIOUREA METHO-P-TOLUENESULFONATE AND SILVER OXIDE IN ACETONE UNTIL A SUBSTANTIAL CONTENT OF THE CARBODIIMIDE IS OBTAINED.
References Cited (Backward Citations)
US2263730A
Cited
US2372873A
Cited
DE924751C
Cited
US2950197A
Cited
US2946819A
Cited
US2942025A
Cited
US2938892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |