Patent US2438313A successfully refreshed from Google Patents.
US2438313A
Expired / Lapsed
US
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Safety locking device for sucker rod couplings
Assignee: Individual
•
Filing: 1945-02-17
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Granted: 1948-03-23
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Expires: 1965-02-17
Abstract
No abstract record available.
Inventors
- 👤 Clyde E Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:17
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/043; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/95; Y10T; Y10T403/00; Y10T403/57; Y10T403/60; Y10T403/602
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |