US2785134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing dry cleaning compositions
Assignee: RR Street and Co Inc
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Filing: 1952-10-29
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Granted: 1957-03-12
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Expires: 1972-10-29
Abstract
No abstract record available.
Inventors
- 👤 Martin B Mathews
- 👤 Charles E Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:52
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/02; D06L1/04; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A METHOD OF PREPARING A DRY CLEANING COMPOSITION WHICH COMPRISES REACTING, UNDER AGITATION, AN ALIPHATIC ALCOHOL DIESTER OF MALEIC ACID, THE ALIPHATIC ALCOHOL RADCAL OF WHICH CONTAIN FROM 6 TO ABOUT 10 CARBON ATOMS, WITH AN ALKALI BISULFITE IN AQUEOUS SOLUTION AND IN A MINERAL OIL HAVING AN INITIAL BOILING POINT NOT SUBSTANTIALLY BELOW 200 DEGREES C., SAID DIESTER OF MALEIC ACID AND SAID ALKALI BISULFITE BEING PRESENT IN PROPORTIONS TO PRODUCE THE ALKALI SALT OF THE SULFOSUCCINIC ACID ESTER OF SAID ALCOHOL, SAID MINERAL OIL BEING PRESENT IN AMOUNTS SUFFICIENT TO MAINTAIN THE REACTION MEDIUM IN A LIQUID CONDITION THROUGHOUT SAID REACTION, AT THE END OF SAID REACTION ADDING TO THE REACTION MIXTURE A LIQUID VOLATILE ORGANIC SOLVENT WHICH IS DISTILLABLE TOGETHER WITH WATER AT A TEMPERATURE BELOW 190 DEGREES C., THEN HEATING THE MIXTURE TO REMOVE THE WATER AND AT LEAST MOST OF THE LAST-MENTIONED LIQUID VOLATILE ORGANIC SOLVENT BUT NOT SAID MINERAL OIL, AND FILTERING WHEREBY TO OBTAIN A LIQUID COMPOSITION SUBSTANTIALLY FREE OF INORGANIC SALTS.
Claim 2
Independent Claim
169 words
A METHOD OF PREPARING A DRY CLEANING COMPOSITION WHICH COMPRISES REACTING, UNDER AGITATION, AN ALIPHATIC ALCOHOL DIESTER OF MALEIC ACID, THE ALIPHATIC ALCOHOL RADCAL OF WHICH CONTAIN FROM 6 TO ABOUT 10 CARBON ATOMS, WITH AN ALKALI BISULFITE IN AQUEOUS SOLUTION AND IN A MINERAL OIL HAVING AN INITIAL BOILING POINT NOT SUBSTANTIALLY BELOW 200 DEGREES C., SAID DIESTER OF MALEIC ACID AND SAID ALKALI BISULFITE BEING PRESENT IN PROPORTIONS TO PRODUCE THE ALKALI SALT OF THE SULFOSUCCINIC ACID ESTER OF SAID ALCOHOL, SAID MINERAL OIL BEING PRESENT IN AMOUNTS SUFFICIENT TO MAINTAIN THE REACTION MEDIUM IN A LIQUID CONDITION THROUGHOUT SAID REACTION, AT THE END OF SAID REACTION ADDING TO THE REACTION MIXTURE A LIQUID VOLATILE ORGANIC SOLVENT WHICH IS DISTILLABLE TOGETHER WITH WATER AT A TEMPERATURE BELOW 190 DEGREES C., THEN HEATING THE MIXTURE TO REMOVE THE WATER AND AT LEAST MOST OF THE LAST-MENTIONED LIQUID VOLATILE ORGANIC SOLVENT BUT NOT SAID MINERAL OIL, AND FILTERING WHEREBY TO OBTAIN A LIQUID COMPOSITION SUBSTANTIALLY FREE OF INORGANIC SALTS.
References Cited (Backward Citations)
US2028091A
Cited
US2327183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |