Patent US5596990A successfully refreshed from Google Patents.
US2643732A
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Vacuum cleaning machine
Assignee: CONTINENTAL CAR NA VAR CORP
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Filing: 1951-09-27
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Granted: 1953-06-30
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Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 Hermon C Keen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:49
CPC Classifications
A; A47; A47L; A47L7/00; A47L7/0004; A47L7/0019; A47L7/0023; A47L7/0028; A47L7/0038; A47L7/0042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2219567A
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US2327181A
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US2339640A
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US2499876A
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US2549181A
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US2538763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |