US1619728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cushion joint for rotary drill pipes
Assignee: U S TOOL CO
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Filing: 1924-02-04
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Granted: 1927-03-01
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Expires: 1944-02-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-02-28 | 1930-08-30 | 1931-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-02-28 | 1934-08-30 | 1935-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-02-28 | 1938-08-30 | 1939-03-01 | $7700.00 | Window Closed / Lapsed |