US2145939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust hood
Assignee: Individual
•
Filing: 1936-09-24
•
Granted: 1939-02-07
•
Expires: 1956-09-24
Abstract
No abstract record available.
Inventors
- 👤 James H Markley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:00
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; E21B21/015; B; B23; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0053; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y10; Y10S; Y10S29/00; Y10S29/086
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) | 1942-02-06 | 1942-08-08 | 1943-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-02-06 | 1946-08-08 | 1947-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-02-06 | 1950-08-08 | 1951-02-07 | $7700.00 | Window Closed / Lapsed |