US1993842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well casing pipe and method of producing same
Assignee: AO Smith Corp
•
Filing: 1934-12-10
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Granted: 1935-03-12
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Expires: 1954-12-10
Abstract
No abstract record available.
Inventors
- 👤 Jasper Thomas Mclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:26
CPC Classifications
E; E21; E21B; E21B17/00; C; C21; C21D; C21D7/00; C21D7/02; C21D7/10; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/909; Y10S29/00; Y10S29/049; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T428/00; Y10T428/12; Y10T428/13
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) | 1938-03-11 | 1938-09-10 | 1939-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-11 | 1942-09-10 | 1943-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-11 | 1946-09-10 | 1947-03-12 | $7700.00 | Window Closed / Lapsed |