US2976117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of hypophosphites
Assignee: La Fonte Electrique SA
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Filing: 1956-07-23
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Granted: 1961-03-21
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Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Pahud Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:59
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/06; C01B25/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR THE PREPARATION OF A HYPOPHOSPHITE COMPRISING FORMING A TEMPERATURE BETWEEN 40 AND 60*C. AN EMULSION OF ELEMENTAL PHOSPHORUS IN AN AQUEOUS SOLUTION OF AT LEAST ONE METAL HYDROXIDE, STIRRING THE EMULSION AND MAINTAINING SAID TEMPERATURE UNTIL ALL THE PHOSPHORUS HAS REACTED WHEREBY A HYPOPHOSPHITE IS FORMED, AND FINALLY HEATING THE RESULTING REACTION MIXTURE AT A TEMPERATURE ABOVE 60*C. UNTIL FORMED PHOSPHINE POLYMERIC IS DECOMPOSED.
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE PREPARATION OF A HYPOPHOSPHITE COMPRISING FORMING A TEMPERATURE BETWEEN 40 AND 60*C. AN EMULSION OF ELEMENTAL PHOSPHORUS IN AN AQUEOUS SOLUTION OF AT LEAST ONE METAL HYDROXIDE, STIRRING THE EMULSION AND MAINTAINING SAID TEMPERATURE UNTIL ALL THE PHOSPHORUS HAS REACTED WHEREBY A HYPOPHOSPHITE IS FORMED, AND FINALLY HEATING THE RESULTING REACTION MIXTURE AT A TEMPERATURE ABOVE 60*C. UNTIL FORMED PHOSPHINE POLYMERIC IS DECOMPOSED.
References Cited (Backward Citations)
GB441474A
Cited
US2595198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |