US2646674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter-aid dispenser
Assignee: Individual
•
Filing: 1951-05-08
•
Granted: 1953-07-28
•
Expires: 1971-05-08
Abstract
No abstract record available.
Inventors
- 👤 Arley A Spell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:29
CPC Classifications
D; D06; D06F; D06F39/00; D06F39/02; B; B01; B01D; B01D37/00; B01D37/02; D06F39/10; D06F43/00; D06F43/08; D06F43/081; D06F43/085
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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |