US2795398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing drill collar
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1954-03-25
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Granted: 1957-06-11
•
Expires: 1974-03-25
Abstract
No abstract record available.
Inventors
- 👤 Ragland Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/04; F16F15/08; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B17/16; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/455; Y10T403/70; Y10T403/7018
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1960688A
Cited
GB532393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |