US2779761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing amine polysulfides
Assignee: Bridgestone Firestone Inc
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Filing: 1952-04-28
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Granted: 1957-01-29
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Expires: 1972-04-28
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:57
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/22; C07C; C07C313/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
METHOD OF PRODUCING POLYTHIO-BIS-SECONDARY AMINES CONTAINING MORE THAN FOUR SULFUR ATOMS PER MOLECULE BY A ONE-STEP REACTION, COMPRISING SIMULTANEOUSLY ADDING A CAUSTIC SOLUTION AND A SOLUTION OF AT LEAST ONE GRAMATOM OF FREE SULFUR IN ONE MOLE OF SULFUR MONOCHLORIDE TO AN ALKALINE AQUEOUS REACTION MEDIUM CONTAINING ONE MOLE AT A SECONDARY AMINE FROM THE GROUP CONSISTING OF WATER SOLUBLE, SATURATED ALIHATIC AND HETEROCYCLIC SECONDARY AMINES, THE SECONDARY AMINE CONTAINING FROM TWO TO FIVE INCLUSIVE CARBON ATOMS PER MOLECULE, MAINTAINING THE PH OF THE REACTION MEDIUM IN THE RANGE OF 8.0 TO 11.5 BY CONTROLLING THE RATE OF ADDING THE CAUSTIC SOLUTION.
Claim 2
Dependent Claim
102 words
METHOD OF PRODUCING POLYTHIO-BIS-SECONDARY AMINES CONTAINING MORE THAN FOUR SULFUR ATOMS PER MOLECULE BY A ONE-STEP REACTION, COMPRISING SIMULTANEOUSLY ADDING A CAUSTIC SOLUTION AND A SOLUTION OF AT LEAST ONE GRAMATOM OF FREE SULFUR IN ONE MOLE OF SULFUR MONOCHLORIDE TO AN ALKALINE AQUEOUS REACTION MEDIUM CONTAINING ONE MOLE AT A SECONDARY AMINE FROM THE GROUP CONSISTING OF WATER SOLUBLE, SATURATED ALIHATIC AND HETEROCYCLIC SECONDARY AMINES, THE SECONDARY AMINE CONTAINING FROM TWO TO FIVE INCLUSIVE CARBON ATOMS PER MOLECULE, MAINTAINING THE PH OF THE REACTION MEDIUM IN THE RANGE OF 8.0 TO 11.5 BY CONTROLLING THE RATE OF ADDING THE CAUSTIC SOLUTION.
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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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |