US2830563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic jack leg
Assignee: Individual
•
Filing: 1954-03-26
•
Granted: 1958-04-15
•
Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 Burton B Burckhalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:20
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1357294A
Cited
GB453560A
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US2337573A
Cited
US2241794A
Cited
US2341463A
Cited
US2474464A
Cited
US2638075A
Cited
GB636568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |