US2469512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siliceous magnesium-containing purifying medium and process of producing it
Assignee: Individual
•
Filing: 1947-01-18
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Granted: 1949-05-10
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Expires: 1967-01-18
Abstract
No abstract record available.
Inventors
- 👤 John J Naugle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:50
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/10; B01J20/12
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) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |