US3011643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand filter apparatus for swimming pools
Assignee: Individual
•
Filing: 1959-03-23
•
Granted: 1961-12-05
•
Expires: 1979-03-23
Abstract
No abstract record available.
Inventors
- 👤 Alvin C Mccoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:02
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/002; B01D24/004; B01D24/02; B01D24/10; B01D24/14; B01D24/46; B01D24/4626; B01D24/4631
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US630249A
Cited
US636447A
Cited
US1423132A
Cited
US1630079A
Cited
US1805667A
Cited
US1962663A
Cited
US1910758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |