US2957904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of alkanediphosphonic acids
Assignee: Shell USA Inc
•
Filing: 1958-02-26
•
Granted: 1960-10-25
•
Expires: 1978-02-26
Abstract
No abstract record available.
Inventors
- 👤 Alan R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:03
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4025; C07F9/4028
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A COMPOUND CONTAINING AT LEAST 19 CARBON ATOMS AND OF THE FORMULA
References Cited (Backward Citations)
US2634288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |