US2631834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand treating apparatus
Assignee: Individual
•
Filing: 1947-04-22
•
Granted: 1953-03-17
•
Expires: 1967-04-22
Abstract
No abstract record available.
Inventors
- 👤 Butzow George Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:40
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/04; B22C5/0486; B22C5/049; B22C5/0495; B22C5/06; Y; Y10; Y10S; Y10S241/00; Y10S241/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US80259A
Cited
US451370A
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US725884A
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US919795A
Cited
US1777164A
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US1758750A
Cited
US2196880A
Cited
US2325665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |