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US3444152A
Expired / Lapsed
US
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Two-stage polymerisation process for chloroprene
Assignee: Distillers Co Yeast Ltd
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Filing: 1965-06-29
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Granted: 1969-05-13
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Expires: 1985-06-29
Abstract
No abstract record available.
Inventors
- 👤 Francis Paul Gintz
- 👤 Richard John Strachan Matthews
- 👤 Godfrey Malcolm Peirce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16; C08F36/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2763635A
Cited
US3147317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |