Patent US3689516A successfully refreshed from Google Patents.
US3689516A
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Bis-carboxyethyl germanium sesquioxide and process for preparing same
Assignee: Daiichi Yakuhin Sangyo KK
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Filing: 1969-03-07
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Granted: 1972-09-05
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Expires: 1989-03-07
Abstract
Abstract The compound bis-carboxyethyl germanium sesquioxide is prepared as illustrated by the following equations:
Inventors
- 👤 Kazuhiko Asai
- 👤 Kazuo Makabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:34
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
51 words
A process of producing bis-carboxyethyl germanium sesquioxide, comprising reacting germaniumchloroform with acrylonitrile to produce B-cyanoethyltrichlorogermanium; hydrolyzing B--cyanoethyltrichlorogermanium in the presence of a mineral acid to produce B-trichlorogermanium propionic acid; reacting B-trichlorogermanium propionic acid with thionyl chloride to produce trichlorogermanium propionyl chloride; and hydrolyzing trichlorogermanium propionyl chloride to obtain bis-carboxyethyl germanium sesquioxide.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |