Patent US2537523A successfully refreshed from Google Patents.
US2537523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable vacuum cleaner
Assignee: Individual
•
Filing: 1948-04-09
•
Granted: 1951-01-09
•
Expires: 1968-04-09
Abstract
No abstract record available.
Inventors
- 👤 Clements A Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:39
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US974304A
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US1422100A
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US1412420A
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US1577070A
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US1742671A
Cited
US1949052A
Cited
US1965614A
Cited
US2067434A
Cited
US2165678A
Cited
US2291770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |