US2835654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making elastomers from polymeric bis-chloroformates, phosgene and diamines
Assignee: EIDP Inc
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Filing: 1954-10-11
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Granted: 1958-05-20
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Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Albert S Carter
- 👤 Maurice L Ernsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
C; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCES OF MAKING CURABLE ELASTOMERIC CONDENSATION PRODUCTS WHICH COMPRISES AGITATING TOGETHER IN AQUEOUS MEDIUM AND IN THE PRESENCE OF AN ACID ACCEPTOR A BIS-CHLOROFORMATE TO PHOSGENE BEING FROM LEAST 875, A PRIMARY DIAMINE, AND PHOSGENE, THE MOLAR RATIO OF THE BIS-CHLOROFORMATE TO PHOSGENE BEING FROM 1:0.15 TO 1:20 AND THE RATIO OF THE MOLES OF DIAMINE TO THE SUM OF THE MOLES OF BIS-CHLOROFORMATE AND PHOSGENE BEING FROM 0.5:1 TO 2.0:1.
Claim 2
Dependent Claim
72 words
A PROCES OF MAKING CURABLE ELASTOMERIC CONDENSATION PRODUCTS WHICH COMPRISES AGITATING TOGETHER IN AQUEOUS MEDIUM AND IN THE PRESENCE OF AN ACID ACCEPTOR A BIS-CHLOROFORMATE TO PHOSGENE BEING FROM LEAST 875, A PRIMARY DIAMINE, AND PHOSGENE, THE MOLAR RATIO OF THE BIS-CHLOROFORMATE TO PHOSGENE BEING FROM 1:0.15 TO 1:20 AND THE RATIO OF THE MOLES OF DIAMINE TO THE SUM OF THE MOLES OF BIS-CHLOROFORMATE AND PHOSGENE BEING FROM 0.5:1 TO 2.0:1.
References Cited (Backward Citations)
GB461237A
Cited
DE912863C
Cited
FR895395A
Cited
FR904939A
Cited
DE904471C
Cited
US2660574A
Cited
US2757191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |