Patent US2312415A successfully refreshed from Google Patents.
US2312415A
Expired / Lapsed
US
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Method of welding the ends of supporting rods to end fittings of well screens
Assignee: EDWARD E JOHNSON Inc
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Filing: 1940-10-12
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Granted: 1943-03-02
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Expires: 1960-10-12
Abstract
No abstract record available.
Inventors
- 👤 Albert A Jens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:38
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B23K11/008; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49602; Y10T403/00; Y10T403/47; Y10T403/477
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) | 1946-03-01 | 1946-08-31 | 1947-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-01 | 1950-08-31 | 1951-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-01 | 1954-08-31 | 1955-03-02 | $7700.00 | Window Closed / Lapsed |