US2712557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of urea
Assignee: BASF SE
•
Filing: 1951-01-24
•
Granted: 1955-07-05
•
Expires: 1971-01-24
Abstract
No abstract record available.
Inventors
- 👤 Michelitsch Walter
- 👤 Geisel Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:56
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/14; C07C273/16; C05; C05C; C05C9/00; C05C9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE RECOVERY OF SOLID UREA IN THE FORM OF SUBSTANTIALLY SPHERICAL PARTICLES WHICH COMPRISES ADDING TO A UREA MELT FROM 0.05% TO 1.0% BY WEIGHT WITH REFERENCE TO THE AMOUNT OF UREA OF ACETYLENE-DIUREA, AND SPRAYING THE RESULTANT MOLTEN PRODUCT TO DIVIDE IT INTO PARTICLES.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE RECOVERY OF SOLID UREA IN THE FORM OF SUBSTANTIALLY SPHERICAL PARTICLES WHICH COMPRISES ADDING TO A UREA MELT FROM 0.05% TO 1.0% BY WEIGHT WITH REFERENCE TO THE AMOUNT OF UREA OF ACETYLENE-DIUREA, AND SPRAYING THE RESULTANT MOLTEN PRODUCT TO DIVIDE IT INTO PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-04 | 1959-01-03 | 1959-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-04 | 1963-01-03 | 1963-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-04 | 1967-01-03 | 1967-07-05 | $7700.00 | Window Closed / Lapsed |