US3600435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis aliphatic phosphonic acid anhydrides
Assignee: Rhone Poulenc Nederland BV
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Filing: 1968-01-26
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Granted: 1971-08-17
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Expires: 1988-01-26
Abstract
Abstract BIS ALIPHATIC PHOSPHORIC ACID ANHYDRIDES REPRESENTED BY THE FORMULA: R-P(=O)(-OH)-O-P(-OH)(=O)-R'' WHEREIN R AND R'' REPRESENT AN ALKYL GROUP INCLUDING HALO ALKYL GROUPS, OF 1 TO 6 CARBON ATOMS, AND PREFERABLY A 2-HALOALKYL GROUP.
Inventors
- 👤 David I Randall
- 👤 Clarence R Stahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:46
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3895; C07F9/3804; C07F9/3808
Claims Analysis
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |