US3224200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainage tile
Assignee: Individual
•
Filing: 1963-04-12
•
Granted: 1965-12-21
•
Expires: 1983-04-12
Abstract
No abstract record available.
Inventors
- 👤 Achey Norwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A GENERALLY TUBULAR DRAIN TILE HAVING RELATIVELY THICK WALLS, SAID TILE HAVING MEANS ON EACH END FOR INTERFITTING ENGAGEMENT WITH CONTIGUOUS TILES, A T-SHAPED SLOT IN EACH TILE AND DISPOSED ON THE LOWERMOST PORTION OF SAID TILE WHEN INSTALLED, SAID T-SHAPED SLOT INCLUDING A LONGITUDINAL SLOT AND A TRANSVERSE SLOT, SAID TRANSVERSE SLOT TERMINATING IN A POSITION SUCH THAT AN IMAGINARY LINE DRAWN BETWEEN THE ENDS OF SUCH TRANSVERSE SLOT IS TANGENTIAL TO THE INTERNAL PERIPHERY OF SAID TILE.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |