US2595198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing phosphorous acid
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-09-25
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Granted: 1952-04-29
•
Expires: 1968-09-25
Abstract
No abstract record available.
Inventors
- 👤 John W Lefforge
- 👤 Robert B Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:14
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF CONTINUOUSLY PRODUCING PHOSPHOROUS ACID, WHICH COMPRISES CONTINUOUSLY SUPPLYING PHOSPHORUS TRICHLORIDE AND WATER, COUNTERCURRENTLY TO AND IN CONTACT WITH EACH OTHER, AND A COLUMN REACTOR CONTAINING A VAPOR SECTION AND A LIQUID SECTION CONSISTING OF A HEEL OF AT LEAST 50% PHOSPHOROUS ACID AND THEREBY CONTINUOUSLY EFFECTING SUBSTANTIALLY COMPLETE HYDROLYSIS OF SAID TRICHLORIDE TO PHOSPHOROUS ACID, AND CONTINUOUSLY WITHDRAWING SAID PHOSPHOROUS ACID FROM SAID REACTOR, SAID REACTION BEING CARRIED OUT AT A TEMPERATURE AT LEAST EQUIVALENT TO THE BOILING POINT OF PHOSPHORUS TRICHLORIDE BUT BELOW THAT TEMPERA-
Claim 2
Independent Claim
89 words
THE METHOD OF CONTINUOUSLY PRODUCING PHOSPHOROUS ACID, WHICH COMPRISES CONTINUOUSLY SUPPLYING PHOSPHORUS TRICHLORIDE AND WATER, COUNTERCURRENTLY TO AND IN CONTACT WITH EACH OTHER, AND A COLUMN REACTOR CONTAINING A VAPOR SECTION AND A LIQUID SECTION CONSISTING OF A HEEL OF AT LEAST 50% PHOSPHOROUS ACID AND THEREBY CONTINUOUSLY EFFECTING SUBSTANTIALLY COMPLETE HYDROLYSIS OF SAID TRICHLORIDE TO PHOSPHOROUS ACID, AND CONTINUOUSLY WITHDRAWING SAID PHOSPHOROUS ACID FROM SAID REACTOR, SAID REACTION BEING CARRIED OUT AT A TEMPERATURE AT LEAST EQUIVALENT TO THE BOILING POINT OF PHOSPHORUS TRICHLORIDE BUT BELOW THAT TEMPERA-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |