US2665750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum concentrator
Assignee: Niagara Blower Co
•
Filing: 1948-04-03
•
Granted: 1954-01-12
•
Expires: 1968-04-03
Abstract
No abstract record available.
Inventors
- 👤 Kals Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:47
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US631958A
Cited
US1469475A
Cited
US1537563A
Cited
US1508130A
Cited
US1883379A
Cited
US2038536A
Cited
US2199967A
Cited
US1996526A
Cited
US2129299A
Cited
US2225959A
Cited
US2304150A
Cited
US2192126A
Cited
US2273804A
Cited
US2249625A
Cited
US2222565A
Cited
US2241114A
Cited
US2402401A
Cited
US2400138A
Cited
US2631018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |