US2912918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blast room with uniform down-draft ventilation
Assignee: Individual
•
Filing: 1957-06-25
•
Granted: 1959-11-17
•
Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 William H Mead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
B; B24; B24C; B24C9/00; B24C9/003; B08; B08B; B08B15/00; B08B15/02; B08B15/026; Y; Y10; Y10S; Y10S55/00; Y10S55/14; Y10S55/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1211325A
Cited
US1230282A
Cited
US2172944A
Cited
US2247891A
Cited
US2292665A
Cited
US2358868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |