US2884403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of dicyandiamide resins by the melt process
Assignee: Bayer AG
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Filing: 1955-05-24
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Granted: 1959-04-28
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Expires: 1975-05-24
Abstract
No abstract record available.
Inventors
- 👤 Zorn Bruno
- 👤 Mauthe Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:38
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS PRECIPITABLE BY ACIDS WHICH COMPRISES HEATING AND MELTING AT A TEMPERATURE BETWEEN 70* AND 200* C., A SUBSTANTIALLY ANHYDROUS MIXTURE OF (1) MIXED DICYANDIAMIDE AND UREA, THE PROPORTION OF THE UREA BEING NOT MORE THAN 90% OF THE WEIGHT OF THE TOTAL OF DICYANDIAMIDE AND UREA OR LESS THAN ABOUT 1 MOL OF THE DICYANDIAMIDE (2) PARAFORMALDEHYDE IN THE PROPORTION OF 0.5-8 MOLS OF FORMALDEHYDE EQUIVALENT FOR 1 MOL TOTAL OF DICYANDIAMIDE AND UREA, AND (3) THE SODIUM SALT OF THE CONDENSATION PRODUCT OF ABOUT 1 MOL OF NAPTHALENE SULFONIC ACID WITH FROM 0.66 TO 1 MOL OF FORMALDEHYDE., THE SAID CONDENSATION PRODUCT BEING IN PROPORTION TO CAUSE THE PRODUCT TO BE PRECIPITABLE BY AN ACID AND, AFTER COOLING TO REMAIN COMPLETELY SOLUBLE IN WATER OR STORAGE OF THE AQUEOUS SOLUTION.
Claim 2
Dependent Claim
139 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS PRECIPITABLE BY ACIDS WHICH COMPRISES HEATING AND MELTING AT A TEMPERATURE BETWEEN 70* AND 200* C., A SUBSTANTIALLY ANHYDROUS MIXTURE OF (1) MIXED DICYANDIAMIDE AND UREA, THE PROPORTION OF THE UREA BEING NOT MORE THAN 90% OF THE WEIGHT OF THE TOTAL OF DICYANDIAMIDE AND UREA OR LESS THAN ABOUT 1 MOL OF THE DICYANDIAMIDE (2) PARAFORMALDEHYDE IN THE PROPORTION OF 0.5-8 MOLS OF FORMALDEHYDE EQUIVALENT FOR 1 MOL TOTAL OF DICYANDIAMIDE AND UREA, AND (3) THE SODIUM SALT OF THE CONDENSATION PRODUCT OF ABOUT 1 MOL OF NAPTHALENE SULFONIC ACID WITH FROM 0.66 TO 1 MOL OF FORMALDEHYDE., THE SAID CONDENSATION PRODUCT BEING IN PROPORTION TO CAUSE THE PRODUCT TO BE PRECIPITABLE BY AN ACID AND, AFTER COOLING TO REMAIN COMPLETELY SOLUBLE IN WATER OR STORAGE OF THE AQUEOUS SOLUTION.
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) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |