Patent US2642342A successfully refreshed from Google Patents.
US2642342A
Expired / Lapsed
US
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Method of crystallizing sodium carbonate
Assignee: Werkspoor NV
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Filing: 1951-04-20
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Granted: 1953-06-16
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Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 Vahl Laszlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:32
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/38; C01D7/40; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A METHOD OF PRODUCING CRYSTALS FROM A SUBSTANTIALLY SATURATED SOLUTION OF SODIUM CARBONATE BY COOLING SAID SOLUTION TO A TEMPERATURE BELOW 31.4* C., WHICH CONSISTS IN ADDING A SMALL AMOUNT OF A SALT OF POLYMANNONIC ACID TO THE SAID SOLUTION.
Claim 2
Independent Claim
40 words
A METHOD OF PRODUCING CRYSTALS FROM A SUBSTANTIALLY SATURATED SOLUTION OF SODIUM CARBONATE BY COOLING SAID SOLUTION TO A TEMPERATURE BELOW 31.4* C., WHICH CONSISTS IN ADDING A SMALL AMOUNT OF A SALT OF POLYMANNONIC ACID TO THE SAID SOLUTION.
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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |