Patent US2666570A successfully refreshed from Google Patents.
US2666570A
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US
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Fiber cutter for suction cleaners
Assignee: BIRTMAN ELECTRIC Co
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Filing: 1949-06-06
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Granted: 1954-01-19
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Expires: 1969-06-06
Abstract
No abstract record available.
Inventors
- 👤 Frank S Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:57
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4013; A47L11/02; A47L11/20; A47L11/204; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |