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US2919704A
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Assignee: Individual
•
Filing: 1954-09-20
•
Granted: 1960-01-05
•
Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 Stedman M Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:10
CPC Classifications
B; B01; B01D; B01D41/00; B01D41/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2190305A
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US2475407A
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US2624618A
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US2745418A
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US2726667A
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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) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |