Patent US2823987A successfully refreshed from Google Patents.
US2823987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New quaternary salts
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1956-07-09
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Granted: 1958-02-18
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Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 Richard J Fielden
- 👤 Homer Ronald Frederick
- 👤 Jones Richard Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:34
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22; B; B61; B61B; B61B10/00; B61B10/02; B61B10/022; C07D471/00; C07D471/12; C07D471/14; C07J; C07J1/00; C07J7/00; C07J75/00; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/11; C08K5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
QUATERNARY SALTS WHICH ARE OF THE FORMULA:
Claim 2
Dependent Claim
7 words
QUATERNARY SALTS WHICH ARE OF THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |