US3356656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polymethylene sulfide
Assignee: Stauffer Chemical Co
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Filing: 1965-09-23
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Granted: 1967-12-05
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Expires: 1985-09-23
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel L Remes
- 👤 Jesse C H Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:54
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/10; E; E02; E02B; E02B17/00; E02B17/02; E02B17/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE PROCESS OF PREPARING POLYMETHYLENE SULFIDE WHICH COMPRISES REACTING A SALT OF TRITHIOCARBONIC ACID SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL TRITHIOCARBONATES AND ALKALINE EARTH METAL TRITHIOCARBONATES WITH A METHYLENE HALIDE IN THE PRESENCE OF A NORMALLY LIQUID AQUEOUS MEDIUM AT A TEMPERATURE OF FROM ABOUT 31 TO ABOUT 80*C., SAID TEMPERATURE RANGE WHEN OPERATING AT ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
59 words
THE PROCESS OF PREPARING POLYMETHYLENE SULFIDE WHICH COMPRISES REACTING A SALT OF TRITHIOCARBONIC ACID SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL TRITHIOCARBONATES AND ALKALINE EARTH METAL TRITHIOCARBONATES WITH A METHYLENE HALIDE IN THE PRESENCE OF A NORMALLY LIQUID AQUEOUS MEDIUM AT A TEMPERATURE OF FROM ABOUT 31 TO ABOUT 80*C., SAID TEMPERATURE RANGE WHEN OPERATING AT ATMOSPHERIC PRESSURE.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |