Patent US2977192A successfully refreshed from Google Patents.
US2977192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of phosphine and sodium hypophosphite
Assignee: FMC Corp
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Filing: 1958-08-26
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Granted: 1961-03-28
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Expires: 1978-08-26
Abstract
No abstract record available.
Inventors
- 👤 Richard W Cummins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:51
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/06; C01B25/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR THE SIMULTANEOUS PRODUCTION OF PHOSPHINE AND SODIUM HYPOPHOSPHITE WHICH COMPRISES REACTING PHOSPHORUS, SODIUM HYDROXIDE, AND A STOICHIOMETRIC AMOUNT OF WATER IN A WATER-ALCOHOL MEDIUM COMPRISING AT LEAST ABOUT 70% BY VOLUME OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL ALCOHOLS, SAID SODIUM HYDROXIDE BTING PRESENT IN THE AMOUNT OF AT LEAST ABOUT 0.60 MOLE PER MOLE OF PHOSPHORUS, WHEREBY SAID PHOSPHINE AND SAID SODIUM HYPOPHOSPHITE ARE PRODUCED IN YIELDS OF AT LEAST ABOUT 95% OF PHOSPHINE AND AT LEAST ABOUT 60% OF SODIUM HYPOPHOSPHITE, SAID SODIUM HYPOPHOSPHITE BEING PRESENT IN THE AMOUNT OF AT LEAST 7 MOLES PER MOLE OF SODIUM ORTHOPHOSPHITE PRODUCED, AND RECOVERING SAID PHOSPHINE AND SODIUM HYPOPHOSPHITE.
Claim 2
Dependent Claim
117 words
A PROCESS FOR THE SIMULTANEOUS PRODUCTION OF PHOSPHINE AND SODIUM HYPOPHOSPHITE WHICH COMPRISES REACTING PHOSPHORUS, SODIUM HYDROXIDE, AND A STOICHIOMETRIC AMOUNT OF WATER IN A WATER-ALCOHOL MEDIUM COMPRISING AT LEAST ABOUT 70% BY VOLUME OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL ALCOHOLS, SAID SODIUM HYDROXIDE BTING PRESENT IN THE AMOUNT OF AT LEAST ABOUT 0.60 MOLE PER MOLE OF PHOSPHORUS, WHEREBY SAID PHOSPHINE AND SAID SODIUM HYPOPHOSPHITE ARE PRODUCED IN YIELDS OF AT LEAST ABOUT 95% OF PHOSPHINE AND AT LEAST ABOUT 60% OF SODIUM HYPOPHOSPHITE, SAID SODIUM HYPOPHOSPHITE BEING PRESENT IN THE AMOUNT OF AT LEAST 7 MOLES PER MOLE OF SODIUM ORTHOPHOSPHITE PRODUCED, AND RECOVERING SAID PHOSPHINE AND SODIUM HYPOPHOSPHITE.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |