US2429043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom hole gas anchor
Assignee: Individual
•
Filing: 1943-04-05
•
Granted: 1947-10-14
•
Expires: 1963-04-05
Abstract
No abstract record available.
Inventors
- 👤 Paul F Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:37
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/06; E; E21; E21B; E21B43/00; E21B43/34; E21B43/35; E21B43/38
Claims Analysis
Total Claims: 0
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US2143836A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |