Patent EP0965572A1 successfully refreshed from Google Patents.
Patent US4600087A successfully refreshed from Google Patents.
US3206435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of tanning resins
Assignee: Boehme Fettchemie GmbH
•
Filing: 1961-03-20
•
Granted: 1965-09-14
•
Expires: 1981-03-20
Abstract
No abstract record available.
Inventors
- 👤 Heyden Rudi
- 👤 Plapper Jurgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/34; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0237; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20; C14C3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
PROCESS FOR THE PREPARATION OF TANNING RESINS WHICH ARE SUBSTANTIALLY COMPLETELY PRECIPITATABLE IN A NARROW RANGE OF ABOUT ONE PH NUMBER COMPRISING THE STEPS OF FORMING A CONDENSATION PRODUCT IN AN AQUEOUS MEDIUM OF (1) 0.40 TO 0.65 MOL OF MELAMINE, (2) 0.35 TO 0.60 MOL OF A DICYANDIAMIDE AND (3) 2.5 TO 4.5 MOLS OF A LOWER ALIPHATIC ALDEHYDE IN COMBINATION WITH (4) 0.2 TO 0.4 MOL NEUTRAL ALKALI METAL SALTS OF A LOW MOLECULAR AROMATIC SULFONIC ACID AT TEMPERATURES FROM ABUT 50 TO 100*C. FOR A PERIOD OF FROM ABOUT 1/2 TO ABOUT 3 HOURS AND DRYING THE CONDENSATION PRODUCT.
Claim 2
Dependent Claim
102 words
PROCESS FOR THE PREPARATION OF TANNING RESINS WHICH ARE SUBSTANTIALLY COMPLETELY PRECIPITATABLE IN A NARROW RANGE OF ABOUT ONE PH NUMBER COMPRISING THE STEPS OF FORMING A CONDENSATION PRODUCT IN AN AQUEOUS MEDIUM OF (1) 0.40 TO 0.65 MOL OF MELAMINE, (2) 0.35 TO 0.60 MOL OF A DICYANDIAMIDE AND (3) 2.5 TO 4.5 MOLS OF A LOWER ALIPHATIC ALDEHYDE IN COMBINATION WITH (4) 0.2 TO 0.4 MOL NEUTRAL ALKALI METAL SALTS OF A LOW MOLECULAR AROMATIC SULFONIC ACID AT TEMPERATURES FROM ABUT 50 TO 100*C. FOR A PERIOD OF FROM ABOUT 1/2 TO ABOUT 3 HOURS AND DRYING THE CONDENSATION PRODUCT.
References Cited (Backward Citations)
DE105054C
Cited
US2733977A
Cited
US2550639A
Cited
US2701749A
Cited
US2709693A
Cited
US2944046A
Cited
US2730516A
Cited
US2852489A
Cited
US2884403A
Cited
US2970033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |