US2835637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alumina/silica catalysts
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1954-11-22
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Granted: 1958-05-20
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Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Dowden Dennis Albert
- 👤 Johnson Leslie Victor
- 👤 Vincent George Clarkson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:52
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; B; B01; B01J; B01J21/00; B01J21/12; B01J23/00; B01J23/12; C03; C03C; C03C11/00; C03C11/005; C03C15/00; C03C3/00; C03C3/04; C03C3/06; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2735; C07C2521/00; C07C2521/02; C07C2521/12; C07C2523/00; C07C2523/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 0
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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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |