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Patent US2787629A successfully refreshed from Google Patents.
US2787629A
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Bis (chloromethane alkyl) phosphonic acid anhydrides
Assignee: Eastman Kodak Co
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Filing: 1952-12-24
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Granted: 1957-04-02
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Expires: 1972-12-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry W Coover
- 👤 Joseph B Dickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:06
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A PROCESS OF PREPARING INSECTICIDAL ORGANIC PHOSPHOROUS COMPOUNDS COMPRISING HEATING TOGETHER A DIALKYLCHLOROMETHANEPHOSPHONATE, THE ALKYL BEING OF 1-4 CARBON ATOMS, WITH A LOWER ALIPHATIC ACID ANHYDRIDE AT ABOUT 150-180 * C.
Claim 2
Dependent Claim
31 words
A PROCESS OF PREPARING INSECTICIDAL ORGANIC PHOSPHOROUS COMPOUNDS COMPRISING HEATING TOGETHER A DIALKYLCHLOROMETHANEPHOSPHONATE, THE ALKYL BEING OF 1-4 CARBON ATOMS, WITH A LOWER ALIPHATIC ACID ANHYDRIDE AT ABOUT 150-180 * C.
Claim 3
Dependent Claim
15 words
AS NEW COMPOUNDS, BIS(CHLOROMETHANE ALKYL) PHOSPHONIC ACID ANHYDRIDES WHEREIN THE ALKYLS ARE OF U-4 CARBONS.
Claim 4
Dependent Claim
15 words
AS NEW COMPOUNDS, BIS(CHLOROMETHANE ALKYL) PHOSPHONIC ACID ANHYDRIDES WHEREIN THE ALKYLS ARE OF U-4 CARBONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |