Patent US2500022A successfully refreshed from Google Patents.
US2500022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialkyl alkoxy methane phosphonates and method of preparation
Assignee: Oldbury Electro Chemical Co
•
Filing: 1946-08-06
•
Granted: 1950-03-07
•
Expires: 1966-08-06
Abstract
No abstract record available.
Inventors
- 👤 Brown James Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A COMPOUND HAVING THE GENERAL FORMULA ROCH2PO(OR)2 WHEREIN R IS A LOW MOLECULAR WEIGHT ALKYL GROUP CHOSEN FROM THE CLASS CONSISTING OF CH3, C2H5 AND C4H9.
Claim 2
Dependent Claim
26 words
A COMPOUND HAVING THE GENERAL FORMULA ROCH2PO(OR)2 WHEREIN R IS A LOW MOLECULAR WEIGHT ALKYL GROUP CHOSEN FROM THE CLASS CONSISTING OF CH3, C2H5 AND C4H9.
References Cited (Backward Citations)
US2397422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |