US2980939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner
Assignee: Whirlpool Corp
•
Filing: 1957-11-18
•
Granted: 1961-04-25
•
Expires: 1977-11-18
Abstract
No abstract record available.
Inventors
- 👤 Charles H Sparklin
- 👤 Emery L Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:44
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L9/0405; A47L9/0411
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1639959A
Cited
US2136247A
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US2136268A
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US2287515A
Cited
FR801152A
Cited
US2168899A
Cited
US2218180A
Cited
US2334732A
Cited
US2380782A
Cited
US2716254A
Cited
US2691791A
Cited
US2807824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |