Patent US3979080A successfully refreshed from Google Patents.
US1611684A
Expired / Lapsed
US
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Rotary drive for vacuum cleaners
Assignee: UNITED ELECTRIC Co
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Filing: 1923-11-03
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Granted: 1926-12-21
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Expires: 1943-11-03
Abstract
No abstract record available.
Inventors
- 👤 Adam A Serva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:14
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L9/0405; A47L9/0422
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) | 1929-12-20 | 1930-06-21 | 1930-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-12-20 | 1934-06-21 | 1934-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-12-20 | 1938-06-21 | 1938-12-21 | $7700.00 | Window Closed / Lapsed |