US3303166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polythioformaldehydes and method of producing them
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1963-05-14
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Granted: 1967-02-07
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Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 Bapseres Pierre
- 👤 Signouret Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:47
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCES FOR PRODUCING POLYTHIOFORMALDEHYDES BY REACTING FORMALDEHYDE WITH DYDROGEN SULFINE, WHICH COMPRISES THE STEPS OF: ADDING FORMALDEHYDE WITH AT LEAST ONE ORGANIC LIQUID CAPABLE OF FORMING AZEOTROPIC MIXTURE WITH WATER, THE SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUERNE, XYLENE, KIOXANE, AND DIMETHYLMETHADIOXANE, THE LIQUID BEING PRESENT IN AN AMOUNT GREATER THAN TWICE THAT OF FORMALDEHYDE, SATURATING THE FORMALDEHYDE-CONTAINING MEDIUM WITH HYDROGEN SULFIDE AT A TEMPERATURE IN THE RANGE FROM 50%C. TO THE BOILING POINT OF SAID AZEOTROPIC MIXTURE, REMOVING WATER BY DISTILLING SAID AZEOTROPIC MIXTURE, AND SEPARATING THE REMAINING LIQUID BY DISTILLING IT FROM THE SOLID POLYTHIOFORMALDEHYDE FORMED.
Claim 2
Dependent Claim
103 words
A PROCES FOR PRODUCING POLYTHIOFORMALDEHYDES BY REACTING FORMALDEHYDE WITH DYDROGEN SULFINE, WHICH COMPRISES THE STEPS OF: ADDING FORMALDEHYDE WITH AT LEAST ONE ORGANIC LIQUID CAPABLE OF FORMING AZEOTROPIC MIXTURE WITH WATER, THE SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUERNE, XYLENE, KIOXANE, AND DIMETHYLMETHADIOXANE, THE LIQUID BEING PRESENT IN AN AMOUNT GREATER THAN TWICE THAT OF FORMALDEHYDE, SATURATING THE FORMALDEHYDE-CONTAINING MEDIUM WITH HYDROGEN SULFIDE AT A TEMPERATURE IN THE RANGE FROM 50%C. TO THE BOILING POINT OF SAID AZEOTROPIC MIXTURE, REMOVING WATER BY DISTILLING SAID AZEOTROPIC MIXTURE, AND SEPARATING THE REMAINING LIQUID BY DISTILLING IT FROM THE SOLID POLYTHIOFORMALDEHYDE FORMED.
References Cited (Backward Citations)
US2206641A
Cited
US1991765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |