Patent US3225935A successfully refreshed from Google Patents.
US3225935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainage bed
Assignee: Uniroyal Inc
•
Filing: 1963-01-10
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Granted: 1965-12-28
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Expires: 1983-01-10
Abstract
No abstract record available.
Inventors
- 👤 John A Porteous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:09
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073; B01D33/09; B01D2201/00; B01D2201/28; B01D2201/282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A ONE-PIECE EXTRUDED PLASTIC DRAINAGE GRID FOR A FILTER COMPRISING: (A) A CORRUGATED SHEET HAVING AN INNER SURFACE AND AN
Claim 2
Dependent Claim
20 words
A ONE-PIECE EXTRUDED PLASTIC DRAINAGE GRID FOR A FILTER COMPRISING: (A) A CORRUGATED SHEET HAVING AN INNER SURFACE AND AN
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |