US3549558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline alumino-silicate catalyst
Assignee: Shell USA Inc
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Filing: 1968-08-29
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Granted: 1970-12-22
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Expires: 1988-08-29
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Berry
- 👤 Hans A Benesi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:57
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/2206; C07C5/222; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C07C5/27; C07C5/2767; C07C5/277; C07C5/2775; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/08; Y; Y10; Y10S; Y10S423/00; Y10S423/21
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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |