US2221572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner construction
Assignee: Rexair Inc
•
Filing: 1937-12-24
•
Granted: 1940-11-12
•
Expires: 1957-12-24
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Brock
- 👤 Nodiah E Hutchens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:02
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/18; A47L9/181; A47L9/182; A47L9/186; A47L9/187; A47L9/188; A47L9/22
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) | 1943-11-12 | 1944-05-13 | 1944-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-12 | 1948-05-13 | 1948-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-12 | 1952-05-13 | 1952-11-12 | $7700.00 | Window Closed / Lapsed |