US3512647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swimming pool filter comprising assembly of separable spacers and having molded plastic grids
Assignee: Marine Swimming Pool Equipment Co
•
Filing: 1967-08-24
•
Granted: 1970-05-19
•
Expires: 1987-08-24
Abstract
No abstract record available.
Inventors
- 👤 Henry R Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:09
CPC Classifications
E; E04; E04H; E04H4/00; E04H4/12; B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D29/62; B01D29/70; B01D29/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1446448A
Cited
US3019905A
Cited
US3187899A
Cited
US3187898A
Cited
US3259248A
Cited
US3315812A
Cited
US3297163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |