US3873266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of polyalkylene polyamine-cyanamide condensation products
Assignee: Sandoz AG
•
Filing: 1973-08-06
•
Granted: 1975-03-25
•
Expires: 1993-08-06
Abstract
Abstract A process for the production of solutions which are suitable for use as fixing agents for anionic dyes, which is characterized by the separation and removal of the water insoluble components from aqueous solutions of the condensation products (A) of polalkylene polyamines and cyanamides or the water soluble salts of (A).
Inventors
- 👤 Kurt Hofer
- 👤 Robert Christian Keller
- 👤 Alfred Emil Zingg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/5264; D06P1/5285; C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; D06P3/00; D06P3/58; D06P3/60; D06P3/62; D21; D21H; D21H21/00; D21H21/14; D21H21/28; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A process according to claim 1 wherein the polyalkylene polyamine is a polyethylene polyamine.
Claim 2
Dependent Claim
36 words
A process according to claim 1 wherein the aqueous solution of the condensation product is allowed to stand at a temperature not above 30*C. to precipitate the ineffective components prior to separation of said ineffective components.
Claim 3
Dependent Claim
24 words
A process according to claim 2 wherein the polyethylene polyamine is selected from the group consisting of diethylene triamine, triethylene tetramine, and tetraethylene pentamine.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein, in step (2), the mixture is allowed to stand for at least 25 hours.
Claim 5
Dependent Claim
22 words
A process according to claim 1 wherein, in step (1), the condensation product (A) or salt thereof is mixed with aqueous acid.
References Cited (Backward Citations)
GB657733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |