US2772899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded oil well drill stem connection with the threads having included crest angleof 90 degrees
Assignee: Hughes Tool Co
•
Filing: 1948-05-15
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Granted: 1956-12-04
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Expires: 1968-05-15
Abstract
No abstract record available.
Inventors
- 👤 Evans Seth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:12
CPC Classifications
F; F16; F16B; F16B33/00; F16B33/02; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/16; F16B7/00; F16B7/18; F16B7/182; Y; Y10; Y10S; Y10S285/00; Y10S285/916
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1141151A
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US1562373A
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US2062699A
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US2062696A
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US2091906A
Cited
US2160263A
Cited
US2215930A
Cited
US2320107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |