US2920097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
O, o-dialkyl-beta-cyanovinyl phosphonates
Assignee: Wyeth Holdings LLC
•
Filing: 1957-12-24
•
Granted: 1960-01-05
•
Expires: 1977-12-24
Abstract
No abstract record available.
Inventors
- 👤 Everett J Frazza
- 👤 Rapoport Lorence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A METHOD OF PREPARING AN O,O-DIALKYL-B-CYANOVINYL PHOSPHONATE WHICH COMPRISES REACTING B-CHLOROACRYLONITRILE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF DIALKYL HYDROGEN PHOSPHITES, THE ALKALI METAL SALTS THEREOF, AND TRIALKYL PHOSPHITES.
Claim 2
Independent Claim
31 words
A METHOD OF PREPARING AN O,O-DIALKYL-B-CYANOVINYL PHOSPHONATE WHICH COMPRISES REACTING B-CHLOROACRYLONITRILE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF DIALKYL HYDROGEN PHOSPHITES, THE ALKALI METAL SALTS THEREOF, AND TRIALKYL PHOSPHITES.
References Cited (Backward Citations)
US2721876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |