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Patent US2843869A successfully refreshed from Google Patents.
US2843869A
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US
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Rotary cleaning tool
Assignee: AT&T Inc
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Filing: 1956-01-17
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Granted: 1958-07-22
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Expires: 1976-01-17
Abstract
No abstract record available.
Inventors
- 👤 Harold W Hermance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4036; A47L11/4041; A47L11/02; A47L11/04; A47L11/08; A47L11/4075; H; H01; H01H; H01H1/00; H01H1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US483503A
Cited
US1584033A
Cited
US2735128A
Cited
US2263624A
Cited
US2371948A
Cited
US2504709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |