US1878432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well screen
Assignee: Layne & Bowler Corp
•
Filing: 1929-03-25
•
Granted: 1932-09-20
•
Expires: 1949-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jesse P Whann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:20
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/088
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) | 1935-09-20 | 1936-03-21 | 1936-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-09-20 | 1940-03-21 | 1940-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-09-20 | 1944-03-21 | 1944-09-20 | $7700.00 | Window Closed / Lapsed |