US2595307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable well servicing rig
Assignee: DRESSER EQUIPMENT Co
•
Filing: 1946-10-09
•
Granted: 1952-05-06
•
Expires: 1966-10-09
Abstract
No abstract record available.
Inventors
- 👤 John P Selberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:56
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US577489A
Cited
US1828643A
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US2151057A
Cited
US2323731A
Cited
US2354922A
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US2464962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |