Patent US2397980A successfully refreshed from Google Patents.
US2397980A
Expired / Lapsed
US
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Vacuum cleaning apparatus
Assignee: Individual
•
Filing: 1943-11-25
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Granted: 1946-04-09
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Expires: 1963-11-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Petrl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:19
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/1608; A47L5/00; A47L5/12; A47L5/22; A47L9/165; A47L9/1658; A47L9/1666; A47L9/1691; 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) | 1949-04-08 | 1949-10-08 | 1950-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-08 | 1953-10-08 | 1954-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-08 | 1957-10-08 | 1958-04-09 | $7700.00 | Window Closed / Lapsed |