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US3398085A
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US
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Catalyst addition and withdrawal process
Assignee: HRI Inc
•
Filing: 1965-09-14
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Granted: 1968-08-20
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Expires: 1985-09-14
Abstract
No abstract record available.
Inventors
- 👤 Theodore M Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:58
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/22; B01J3/00; B01J3/02; C; C10; C10G; C10G49/00; C10G49/10; C10G49/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2441820A
Cited
US2486650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |