Patent AU472889B2 successfully refreshed from Google Patents.
US2806049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halo-substituted organo-phosphorous compounds
Assignee: Shell Development Co
•
Filing: 1953-10-16
•
Granted: 1957-09-10
•
Expires: 1973-10-16
Abstract
No abstract record available.
Inventors
- 👤 William J Raab
- 👤 Richard R Whetstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:25
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4018
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
6 words
PHOSPHONIC ACID ESTER HAVING THE FORMULA
References Cited (Backward Citations)
US2550651A
Cited
US2622096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |