Patent US1856912A successfully refreshed from Google Patents.
US1856912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved method of shooting wells
Assignee: Dow Chemical Co
•
Filing: 1930-06-04
•
Granted: 1932-05-03
•
Expires: 1950-06-04
Abstract
No abstract record available.
Inventors
- 👤 John J Grebe
- 👤 Poffenberger Noland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/119; E21B43/1195; F; F42; F42D; F42D5/00; F42D5/04; F42D5/045
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) | 1935-05-03 | 1935-11-02 | 1936-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-03 | 1939-11-02 | 1940-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-03 | 1943-11-02 | 1944-05-03 | $7700.00 | Window Closed / Lapsed |