Patent US2909558A successfully refreshed from Google Patents.
US2909558A
Expired / Lapsed
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Phosphonoformamides and methods for preparation
Assignee: Monsanto Chemicals Ltd
•
Filing: 1957-05-27
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Granted: 1959-10-20
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Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Reetz Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:37
CPC Classifications
C; C07; C07C; C07C265/00; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4062; C07F9/4065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
THE METHOD OF PREPARING DIALKYL N-ALKYL PHOSPHONOFORMAMIDE WHICH COMPRISES HEATING ALKYL ISOCYANATE WITH DIALKYL PHOSPHITE UNTIL A SUBSTANTIAL COMBINATION HAS OCCURRED, AND SEPARATING THE RESULTING PRODUCT.
Claim 2
Independent Claim
26 words
THE METHOD OF PREPARING DIALKYL N-ALKYL PHOSPHONOFORMAMIDE WHICH COMPRISES HEATING ALKYL ISOCYANATE WITH DIALKYL PHOSPHITE UNTIL A SUBSTANTIAL COMBINATION HAS OCCURRED, AND SEPARATING THE RESULTING PRODUCT.
Claim 3
Dependent Claim
5 words
THE COMPOUNDS OF THE STRUCTURE
Claim 4
Dependent Claim
5 words
THE COMPOUNDS OF THE STRUCTURE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |