Patent US3075245A successfully refreshed from Google Patents.
Patent US3618329A successfully refreshed from Google Patents.
US3618329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for installing subsoil moisture barrier
Assignee: Phillips Petroleum Co
•
Filing: 1969-08-19
•
Granted: 1971-11-09
•
Expires: 1989-08-19
Abstract
Abstract A METHOD OF INSTALLING A SUBSOIL MOSITURE BARRIER OF WATER-IMPERVIOUS PLASTIC MATERIAL IS DISCLOSED WITH APPARATUS FOR ITS CONTINUOUS INSTALLATION.
Inventors
- 👤 Donald O Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:15
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02D; E02D31/00; E02D31/002; E02D31/004; E02F5/12
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |