Patent US4271070A successfully refreshed from Google Patents.
US2778733A
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Apparatus for the manufacture of urea, formed of aluminum bronze
Assignee: Pechiney SA
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Filing: 1953-12-07
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Granted: 1957-01-22
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Frejacques Jean Leon Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:19
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/04; C22; C22C; C22C9/00; C22C9/01; Y; Y02; Y02P; Y02P20/00; Y02P20/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
APPARATUS FOR USE IN THE SYNTHESIS OF UREA FROM AMMONIA AND CARBON DIOXIDE, CHARACTERIZED IN THAT THE PARTS OF THE APPARATUS IN CONTACT WITH THE HOT REACTION MEDIUM ARE FORMED OF ALUMINUM BRONZE, CONTAINING IRON BALANCE COPPER; THE RATIO OF IRION TO MANGANESE BEING LESS THAN O.5
Claim 2
Dependent Claim
47 words
APPARATUS FOR USE IN THE SYNTHESIS OF UREA FROM AMMONIA AND CARBON DIOXIDE, CHARACTERIZED IN THAT THE PARTS OF THE APPARATUS IN CONTACT WITH THE HOT REACTION MEDIUM ARE FORMED OF ALUMINUM BRONZE, CONTAINING IRON BALANCE COPPER; THE RATIO OF IRION TO MANGANESE BEING LESS THAN O.5
References Cited (Backward Citations)
US2129689A
Cited
US2430419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |