Patent US3335142A successfully refreshed from Google Patents.
US3335142A
Expired / Lapsed
US
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Process for the preparation of n, n'-disubstituted ureas
Assignee: Wyeth Holdings LLC
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Filing: 1965-07-07
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Granted: 1967-08-08
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Expires: 1985-07-07
Abstract
No abstract record available.
Inventors
- 👤 Hardy William Baptist
- 👤 Bennett Robert Putnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:37
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/42; C07C; C07C273/00; C07C273/18; C07C273/1809
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS OF PREPARING AROMATIC AND HETEROAROMATIC N,N''-DISUBSTITUTED UREAS WHICH COMPRISES REACTING AT PRESSURES WITHIN THE RANGE OF 40 TO 100,000 POUNDS PER SQUARE INCH AND TEMPERATURES BETWEEN 60* C. AND THE TEMPERATURE OF DECOMPOSITION AND IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF A CATALYST CONSISTING ESSENTIALLY OF A NOBLE METAL AND A LEWIS ACID, CARBON MONOXIDE, WATER AND AN AROMATIC OR HETEROAROMATIC NITRO COMPOUND, SAID REACTION BEING CONDUCTED UNDER CONDITIONS OF SUPER-ATMOSPHERIC PRESSURE AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH THE STARTING MATERIALS AND THE PRODUCT UREA DECOMPOSE.
Claim 2
Dependent Claim
91 words
A PROCESS OF PREPARING AROMATIC AND HETEROAROMATIC N,N''-DISUBSTITUTED UREAS WHICH COMPRISES REACTING AT PRESSURES WITHIN THE RANGE OF 40 TO 100,000 POUNDS PER SQUARE INCH AND TEMPERATURES BETWEEN 60* C. AND THE TEMPERATURE OF DECOMPOSITION AND IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF A CATALYST CONSISTING ESSENTIALLY OF A NOBLE METAL AND A LEWIS ACID, CARBON MONOXIDE, WATER AND AN AROMATIC OR HETEROAROMATIC NITRO COMPOUND, SAID REACTION BEING CONDUCTED UNDER CONDITIONS OF SUPER-ATMOSPHERIC PRESSURE AT AN ELEVATED TEMPERATURE BELOW THAT AT WHICH THE STARTING MATERIALS AND THE PRODUCT UREA DECOMPOSE.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |