US2789404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collecting
Assignee: Holman Brothers Ltd
•
Filing: 1955-01-11
•
Granted: 1957-04-23
•
Expires: 1975-01-11
Abstract
No abstract record available.
Inventors
- 👤 Downing Robert Ernest
- 👤 James Eric Basil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:50
CPC Classifications
A; A47; A47L; A47L7/00; A47L7/0095; A47L5/00; A47L5/12; A47L5/16; A47L5/18; B; B24; B24B; B24B55/00; B24B55/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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CH271710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |