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US2933152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Central vacuum cleaning unit
Assignee: Individual
•
Filing: 1958-07-18
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Granted: 1960-04-19
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
- 👤 Arvell A Carpenter
- 👤 James R Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:25
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/102; A47L5/00; A47L5/12; A47L5/22; A47L5/38
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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |