US2850044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drill rod
Assignee: Sandvik AB
•
Filing: 1955-03-14
•
Granted: 1958-09-02
•
Expires: 1975-03-14
Abstract
No abstract record available.
Inventors
- 👤 Kihlgren Erik Oskar Gosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
E; E21; E21B; E21B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306690A
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US1357564A
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US1697086A
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US1947969A
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US2065898A
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US2209290A
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US2308307A
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US2258564A
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US2319250A
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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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |