US1840305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil refining still
Assignee: AO Smith Corp
•
Filing: 1928-07-13
•
Granted: 1932-01-12
•
Expires: 1948-07-13
Abstract
No abstract record available.
Inventors
- 👤 Orrin E Andrus
- 👤 Hermanson Sune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/156; B21C37/158; Y; Y10; Y10S; Y10S122/00; Y10S122/13; Y10S29/00; Y10S29/048
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1935-01-11 | 1935-07-13 | 1936-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-11 | 1939-07-13 | 1940-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-11 | 1943-07-13 | 1944-01-12 | $7700.00 | Window Closed / Lapsed |