US2634261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea complexes
Assignee: Shell Development Co
•
Filing: 1948-01-09
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Granted: 1953-04-07
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Expires: 1968-01-09
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Fetterly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
B; B01; B01J; B01J19/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
27 words
AS A NEW COMPOSITION OF MATTER, A CRYSTALLINE COMPLEX OF UREA WITH AN ALIPHATIC COMPOUND OF THE GROUP CONSISTING OF PRIMARY ALKYLAMINES, SECONDARY DIALKYLAMINES, MONONITROALKENES AND MONONITROALKANES.
References Cited (Backward Citations)
US1051926A
Cited
US1951518A
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US2131127A
Cited
US2253528A
Cited
US2376008A
Cited
US2520715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |