USRE28189E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of conducting waste liquid by vacuum through long conduits of pneumatic sewage disposal systems
Assignee: Wartsila Oy AB
•
Filing: 1973-11-01
•
Granted: 1974-10-08
•
Expires: 1993-11-01
Abstract
Abstract 1. IN A METHOD OF CONDUCTING WASTE LIQUID IN A PNEUMATIC SEWAGE DISPOSAL SYSTEM THROUGH A RELATIVELY LONG PRIMARY PIPE LINE OR CONDUIT TO A RECEIVING TANK UNDER VACUUM FROM A PLURALITY OF SANITARY CONVENIENCES COMMUNICATING WITH SAID PRIMARY CONDUIT, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF INTERMITTENTLY FLOWING WASTE LIQUID FROM A PLURALITY OF SANITARY CONVENIENCES TO SAID PRIMARY CONDUIT, AND MIXING AIR WITH WASTE LIQUID ONLY DURING THE INTERVALS OF TIME SUCH LIQUID FLOWS FROM SAID SANITARY CONVENIENCES TO SAID PRIMARY CONDUIT. D R A W I N G
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:31
CPC Classifications
E; E03; E03F; E03F1/00; E03F1/006; E03F1/007; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3109
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |