Patent US2994098A successfully refreshed from Google Patents.
US2994098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner with flexible rotary-pistons
Assignee: Individual
•
Filing: 1957-01-23
•
Granted: 1961-08-01
•
Expires: 1977-01-23
Abstract
No abstract record available.
Inventors
- 👤 Fukuba Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:19
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/02; A47L5/04
Claims Analysis
Total Claims: 0
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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) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |