US2074819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating materials
Assignee: Individual
•
Filing: 1933-05-02
•
Granted: 1937-03-23
•
Expires: 1953-05-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Weitzenkorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; C; C22; C22B; C22B4/00; C22B4/04; H; H05; H05B; H05B7/00; H05B7/18; H05B7/22
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) | 1940-03-22 | 1940-09-21 | 1941-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-22 | 1944-09-21 | 1945-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-22 | 1948-09-21 | 1949-03-23 | $7700.00 | Window Closed / Lapsed |