Patent US3239759A successfully refreshed from Google Patents.
Patent US3200136A successfully refreshed from Google Patents.
US3200136A
Expired / Lapsed
US
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Metal chelates of alpha-hydroxy-carboxylic acids and their preparation
Assignee: Beecham Research Laboratories Ltd
•
Filing: 1963-07-09
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Granted: 1965-08-10
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Grossmith Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:35
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/01; C07C65/03; C07C65/05; C07C65/10; C07C59/00; C07C59/01; C07C59/08; C07C59/10; C07C59/105; C07C59/235; C07C59/245; C07C59/255; C07C59/265; C07F; C07F1/00; C07F1/005; C07F15/00; C07F15/02; C07F15/025; C07F3/00; C07F3/003; C07F5/00; C07F5/06; C07F5/069
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A CHELATE OF THE FORMULA:
Claim 2
Dependent Claim
5 words
A CHELATE OF THE FORMULA:
References Cited (Backward Citations)
CA531682A
Cited
US1846880A
Cited
DE540326C
Cited
US2042019A
Cited
GB503212A
Cited
US2327815A
Cited
US2691667A
Cited
US3047602A
Cited
US3091626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |