Patent US2884401A successfully refreshed from Google Patents.
US2884401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbery material comprising certain cross-linked soft polythiourea high polymers and process of making same
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-04-09
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Granted: 1959-04-28
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 George L Wesp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A RUBBERY MATERIAL HAVING HIGH RESISTANCE TO THE ACTION OF ORGANIC SOLVENTS COMPRISING A CROSS-LINKED POLYTHIOUREA HIGH POLYMER, SAID HIGH POLYMER PRIOR TO CROSSLINKING HAVING A SECOND-ORDER TRANSITION TEMPERATURE BELOW 20* C. AND EXHIBITING COLD FLOW AT 20* C. AND HAVING A SPECIFIC VISCOSITY OF AT LEAST 0.1 AS MEASURED ON A 1 PERCENT SOLUTION THEREOF IN DIMETHYLFORMAIDE AT 25* C., THE POLYMER CHAIN AND THE TERMINAL GROUPS THEREOF HAVING BEEN DERIVED FROM A POLYTHIOUREA-FORMING REACTION MIXTURE FREE FROM ADDITIVES THAT WOULD HALT THE POLYMERIZATION REACTION BEFORE A HIGH MOLECULAR WEIGHT POLYMER WAS OBTAINED, SAID POLYMER CHAIN CONSISTING OF RECURRING UNITS HAVING THE FORMULA.
Claim 2
Dependent Claim
104 words
A RUBBERY MATERIAL HAVING HIGH RESISTANCE TO THE ACTION OF ORGANIC SOLVENTS COMPRISING A CROSS-LINKED POLYTHIOUREA HIGH POLYMER, SAID HIGH POLYMER PRIOR TO CROSSLINKING HAVING A SECOND-ORDER TRANSITION TEMPERATURE BELOW 20* C. AND EXHIBITING COLD FLOW AT 20* C. AND HAVING A SPECIFIC VISCOSITY OF AT LEAST 0.1 AS MEASURED ON A 1 PERCENT SOLUTION THEREOF IN DIMETHYLFORMAIDE AT 25* C., THE POLYMER CHAIN AND THE TERMINAL GROUPS THEREOF HAVING BEEN DERIVED FROM A POLYTHIOUREA-FORMING REACTION MIXTURE FREE FROM ADDITIVES THAT WOULD HALT THE POLYMERIZATION REACTION BEFORE A HIGH MOLECULAR WEIGHT POLYMER WAS OBTAINED, SAID POLYMER CHAIN CONSISTING OF RECURRING UNITS HAVING THE FORMULA.
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) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |