US3856893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid ionic phosphorus compounds
Assignee: Hoechst AG
•
Filing: 1972-12-13
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Granted: 1974-12-24
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Expires: 1992-12-13
Abstract
Abstract Compounds of the formula IN WHICH R1 represents hydrogen or methyl, R2 and R3 stand for hydrogen or alkyl and X represents an aliphatic ammonium group and their use as tensidies, emulsifiers, and extraction agent in the liquid-liquid extraction of zinc.
Inventors
- 👤 H Diery
- 👤 U Cuntze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:27
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/141; C07F9/1411; C11; C11D; C11D1/00; C11D1/88; C11D1/886
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
5 words
COMPOUNDS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
5 words
COMPOUNDS OF THE GENERAL FORMULA
Claim 3
Dependent Claim
5 words
A compound of the formula
Claim 4
Dependent Claim
5 words
A compound of the formula
Claim 5
Dependent Claim
5 words
A compound of the formula
Claim 6
Dependent Claim
5 words
A compound of the formula
Claim 7
Dependent Claim
5 words
A compound of the formula
Claim 8
Dependent Claim
5 words
A compound of the formula
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |