Patent US2511249A successfully refreshed from Google Patents.
US2511249A
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Sodium potassium pyrophosphates and method for producing same
Assignee: Monsanto Chemicals Ltd
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Filing: 1944-05-17
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Granted: 1950-06-13
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Expires: 1964-05-17
Abstract
No abstract record available.
Inventors
- 👤 Charles B Durgin
- 👤 Robert N Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:32
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF PREPARING SODIUM POTASSIUM PYROPHOSPHATE, WHICH COMPRISES MIXING A 50% SOLUTION OF NA2PHO4 WITH AN APPROXIMATELY 46% SOLUTION OF K2HPO4 IN THE PROPORTIONS ADAPTED TO SUPPLY 50.3 PARTS BY WEIGHT OF NA2HPO4 TO 49.7 PARTS BY WEIGHT OF K2HPO4, DRUM DRYING THE RESULTING MIXTURE AND THEN HEATING THE DRIED MATERIAL TO THE PYROPHOSPHATE FORMING TEMPERATURE TO PRODUCE A PRODUCT CONSISTING ESSENTIALLY OF NA2K2P2O7, SAID PRODUCT BEING CHARACTERIZED BY HAVING A SUBSTANTIALLY IMPROVED SOLUTION RATE AND RESISTANCE TO MOISTURE VAPOR ABSORPTION OVER THE CORRESPONDING MECHANICAL MIXTURE OF NA4P2O7 AND K4P2O7.
Claim 2
Independent Claim
91 words
THE METHOD OF PREPARING SODIUM POTASSIUM PYROPHOSPHATE, WHICH COMPRISES MIXING A 50% SOLUTION OF NA2PHO4 WITH AN APPROXIMATELY 46% SOLUTION OF K2HPO4 IN THE PROPORTIONS ADAPTED TO SUPPLY 50.3 PARTS BY WEIGHT OF NA2HPO4 TO 49.7 PARTS BY WEIGHT OF K2HPO4, DRUM DRYING THE RESULTING MIXTURE AND THEN HEATING THE DRIED MATERIAL TO THE PYROPHOSPHATE FORMING TEMPERATURE TO PRODUCE A PRODUCT CONSISTING ESSENTIALLY OF NA2K2P2O7, SAID PRODUCT BEING CHARACTERIZED BY HAVING A SUBSTANTIALLY IMPROVED SOLUTION RATE AND RESISTANCE TO MOISTURE VAPOR ABSORPTION OVER THE CORRESPONDING MECHANICAL MIXTURE OF NA4P2O7 AND K4P2O7.
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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) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |