US2572344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of inorganic sulfates from alkali metal benzenesulfonate and its homologues
Assignee: Wyandotte Chemicals Corp
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Filing: 1949-03-23
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Granted: 1951-10-23
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Expires: 1969-03-23
Abstract
No abstract record available.
Inventors
- 👤 Donald R Jackson
- 👤 William K Langdon
- 👤 Thomas H Vaughn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:36
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF REMOVING ALKALI METAL SULFATE FROM A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL BENEZENESULFONATE AND ALIPHATICALLY SUBSTITUTED HOMOLOGUES THEREOF WHEREIN THE SAID ALIPHATIC GROUP COMPRISE A TOTAL OF 1-4 CARBON ATOMS, WHICH COMPRISES FORMING AN AQUEOUS MIXTURE OF THESE SALTS WITH SUFFICIENT WATER TO DISSOLVE ALL OF THE SULFONATE, THE AMOUNT OF SULFONATE IN SAID MIXTURE BEING WATER THAN THE AMOUNT BY WEIGHT OF WATER, MAINTAINING THE TEMPERATURE OF THIS MIXTURE BETWEEN THAT WHICH IS REQUIRED TO DISSOLVE ALL OF THE SULFONATE AND THE BOILING POINT OF THE SOLUTION, AND SEPARATING THE RESULTANT SOLUTION FROM THE UNDISSOLVED INORGANIC SULFATE.
Claim 2
Independent Claim
105 words
THE METHOD OF REMOVING ALKALI METAL SULFATE FROM A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL BENEZENESULFONATE AND ALIPHATICALLY SUBSTITUTED HOMOLOGUES THEREOF WHEREIN THE SAID ALIPHATIC GROUP COMPRISE A TOTAL OF 1-4 CARBON ATOMS, WHICH COMPRISES FORMING AN AQUEOUS MIXTURE OF THESE SALTS WITH SUFFICIENT WATER TO DISSOLVE ALL OF THE SULFONATE, THE AMOUNT OF SULFONATE IN SAID MIXTURE BEING WATER THAN THE AMOUNT BY WEIGHT OF WATER, MAINTAINING THE TEMPERATURE OF THIS MIXTURE BETWEEN THAT WHICH IS REQUIRED TO DISSOLVE ALL OF THE SULFONATE AND THE BOILING POINT OF THE SOLUTION, AND SEPARATING THE RESULTANT SOLUTION FROM THE UNDISSOLVED INORGANIC SULFATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |