Patent US2631688A successfully refreshed from Google Patents.
US2631688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collecting and air purifying apparatus
Assignee: Individual
•
Filing: 1946-06-17
•
Granted: 1953-03-17
•
Expires: 1966-06-17
Abstract
No abstract record available.
Inventors
- 👤 Michael B Osborne
- 👤 Soden Adolph F Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:41
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/18; A47L9/181; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30; A47L7/00; A47L7/04; A47L9/102; A47L9/185
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1259326A
Cited
US1253939A
Cited
US1854214A
Cited
US1697918A
Cited
US1879710A
Cited
US1954066A
Cited
US1891175A
Cited
US2184732A
Cited
US2167786A
Cited
US2297933A
Cited
US2289324A
Cited
US2330621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |