Patent US1655931A successfully refreshed from Google Patents.
US1655931A
Expired / Lapsed
US
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Oil-refining still and method of making the same by electric-arc welding
Assignee: AO Smith Corp
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Filing: 1926-03-13
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Granted: 1928-01-10
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Expires: 1946-03-13
Abstract
No abstract record available.
Inventors
- 👤 Clifford B Langstroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:56
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/0026; Y; Y10; Y10S; Y10S220/00; Y10S220/29; Y10S29/00; Y10S29/048; Y10S76/00; Y10S76/05
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) | 1931-01-09 | 1931-07-11 | 1932-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-09 | 1935-07-11 | 1936-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-09 | 1939-07-11 | 1940-01-10 | $7700.00 | Window Closed / Lapsed |