US2222030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the separation of materials
Assignee: MARCUS A WALKER
•
Filing: 1938-06-09
•
Granted: 1940-11-19
•
Expires: 1958-06-09
Abstract
No abstract record available.
Inventors
- 👤 Hague Harold George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
B; B03; B03B; B03B13/00; B03B13/005; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/4238; Y10T137/4245; Y10T137/4259; Y10T137/4891; Y10T137/6851; Y10T137/7722; Y10T137/7758; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/8593; Y10T137/86187; Y10T137/86389; Y10T137/86405; Y10T137/86421; Y10T137/87917
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) | 1943-11-19 | 1944-05-20 | 1944-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-19 | 1948-05-20 | 1948-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-19 | 1952-05-20 | 1952-11-19 | $7700.00 | Window Closed / Lapsed |