US2919262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making polysulfide liquid polymers
Assignee: Dow Chemical Co
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Filing: 1956-04-23
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Granted: 1959-12-29
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Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 William R Nummy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:33
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR EFFECTING THE REDUCTIVE CLEAVAGE OF DISULFIDE GROUPS IN NORMALLY SOLID HIGH MOLECULAR WEIGHT POLYSULFIDE POLYMERS TO YIELD LIQUID PRODUCTS HAVING TERMINAL THIO GROUPS, WHICH PROCESS COMPRISES REACTING A MIXTURE COMPRISING A NORMALLY SOLID POLYSULFIDE POLYMER CONTAINING A PLURALITY OF DISULFIDE GROUPS OF THE FORMULA -R-S-S-R-, WHEREIN R REPRESENTS RADICAL OF THE GROUP CONSISTING OF -CNH2N-, WHEREIN N IS AN INTEGER FROM 2 TO 6, -CH2CH2OCH2CH2-, AND
Claim 2
Dependent Claim
69 words
A PROCESS FOR EFFECTING THE REDUCTIVE CLEAVAGE OF DISULFIDE GROUPS IN NORMALLY SOLID HIGH MOLECULAR WEIGHT POLYSULFIDE POLYMERS TO YIELD LIQUID PRODUCTS HAVING TERMINAL THIO GROUPS, WHICH PROCESS COMPRISES REACTING A MIXTURE COMPRISING A NORMALLY SOLID POLYSULFIDE POLYMER CONTAINING A PLURALITY OF DISULFIDE GROUPS OF THE FORMULA -R-S-S-R-, WHEREIN R REPRESENTS RADICAL OF THE GROUP CONSISTING OF -CNH2N-, WHEREIN N IS AN INTEGER FROM 2 TO 6, -CH2CH2OCH2CH2-, AND
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) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |