US2839564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic esters of boric acid
Assignee: Shell Development Co
•
Filing: 1953-02-17
•
Granted: 1958-06-17
•
Expires: 1973-02-17
Abstract
No abstract record available.
Inventors
- 👤 Garner Philip James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C07; C07F; C07F5/00; C07F5/02; C07F5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
CYCLIC ESTERS OF BORIC ACID HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
9 words
CYCLIC ESTERS OF BORIC ACID HAVING THE GENERAL 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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |