Patent FR1507805A successfully refreshed from Google Patents.
US2835693A
Expired / Lapsed
US
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Preparation of esters of boronic and borinic acids
Assignee: Shell Development Co
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Filing: 1955-12-19
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Granted: 1958-05-20
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Expires: 1975-12-19
Abstract
No abstract record available.
Inventors
- 👤 Vernon W Buls
- 👤 Richard I Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:41
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/02; C07F5/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A PROCESS FOR THE PREPARATION OF ALKYL ESTERS OF OXYGEN ACIDS OF BORON, SAID ESTERS HAVING THE FORMULA
Claim 2
Dependent Claim
18 words
A PROCESS FOR THE PREPARATION OF ALKYL ESTERS OF OXYGEN ACIDS OF BORON, SAID ESTERS HAVING 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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |