US2478066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of olefins in the presence of nitrogen compounds
Assignee: Shell Development Co
•
Filing: 1947-08-07
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Granted: 1949-08-02
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Expires: 1967-08-07
Abstract
No abstract record available.
Inventors
- 👤 Carolina Catharina Johan Peski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:16
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C08; C08F; C08F10/00; C07C2531/00; C07C2531/02; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2462680A
Cited
US2156718A
Cited
US2377411A
Cited
US2237459A
Cited
US2398926A
Cited
US2405950A
Cited
US2462678A
Cited
US2439528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |