US2153553A
Expired / Lapsed
US
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Polymerization of olefins
Assignee: Imperial Chemical Industries Ltd
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Filing: 1937-02-02
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Granted: 1939-04-11
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Expires: 1957-02-02
Abstract
No abstract record available.
Inventors
- 👤 Fawcett Eric William
- 👤 Gibson Reginald Oswald
- 👤 Perrin Michael Willcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:46
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; C; C08; C08F; C08F10/00; D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; Y; Y10; Y10S; Y10S215/00; Y10S215/04; Y10S36/00; Y10S36/02; Y10S8/00; Y10S8/09; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T442/00; Y10T442/30; Y10T442/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-04-10 | 1942-10-10 | 1943-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-10 | 1946-10-10 | 1947-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-10 | 1950-10-10 | 1951-04-11 | $7700.00 | Window Closed / Lapsed |