US2429943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passing liquid downward through first and second beds of zeolite and thereafter passing liquid downward through said second and first beds of zeolite
Assignee: Graver Energy Systems Inc
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Filing: 1944-12-18
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Granted: 1947-10-28
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Expires: 1964-12-18
Abstract
No abstract record available.
Inventors
- 👤 Frank D Prager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05; B01J49/08
Claims Analysis
Total Claims: 0
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US2368574A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |