US3817864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sanitary drainage system
Assignee: Carlson & Sons A
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Filing: 1972-06-02
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Granted: 1974-06-18
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Expires: 1992-06-02
Abstract
Abstract A novel and improved sanitary drainage system is provided wherein the septic tank of the system is fabricated from Fiberglas which has advantages over the use of pre-cast concrete or other material heretofore used in that it is non-corrosive, impervious and light and strong with some flexibility. The Fiberglas septic tank has a generally hemi-spherical, furstoconical or polygonal shape.
Inventors
- 👤 H Carlson
- 👤 J Pinezich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; E; E03; E03F; E03F1/00; E03F1/002; E03F11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |