Patent US3326665A successfully refreshed from Google Patents.
US3326665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of granular urea-aldehyde fertilizer
Assignee: Hoechst AG
•
Filing: 1964-07-10
•
Granted: 1967-06-20
•
Expires: 1984-07-10
Abstract
No abstract record available.
Inventors
- 👤 Schafer Helmut Karl
- 👤 Krause Paul Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:30
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN A PROCESS FOR THE MANUFACTURE OF FERTILIZERS BY CONDENSING UREA AND AN ALDEHYDE HAVING THREE TO FOUR CARBON ATOMS WITH THE EXCLUSION OF A SOLVENT, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE STARTING PRODUCTS, PRIOR TO THE CONDENSATION, A SWELLABLE SUBSTANCE OF MEDIUM- TO HIGH-MOLECULAR WEIGHT IN AN AMOUNT OF FROM 0.2 TO 5 PERCENT BY WEIGHT OF THE FINAL PRODUCT.
Claim 2
Dependent Claim
62 words
IN A PROCESS FOR THE MANUFACTURE OF FERTILIZERS BY CONDENSING UREA AND AN ALDEHYDE HAVING THREE TO FOUR CARBON ATOMS WITH THE EXCLUSION OF A SOLVENT, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE STARTING PRODUCTS, PRIOR TO THE CONDENSATION, A SWELLABLE SUBSTANCE OF MEDIUM- TO HIGH-MOLECULAR WEIGHT IN AN AMOUNT OF FROM 0.2 TO 5 PERCENT BY WEIGHT OF THE FINAL PRODUCT.
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |