Patent US2716253A successfully refreshed from Google Patents.
US2716253A
Expired / Lapsed
US
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Portable vacuum cleaner structure
Assignee: BIRTMAN ELECTRIC Co
•
Filing: 1950-02-10
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Granted: 1955-08-30
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Expires: 1970-02-10
Abstract
No abstract record available.
Inventors
- 👤 Schwarz Joseph Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:31
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/009; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L9/0009; A47L9/0018; A47L9/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-29 | 1959-02-28 | 1959-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-29 | 1963-02-28 | 1963-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-29 | 1967-02-28 | 1967-08-30 | $7700.00 | Window Closed / Lapsed |