Patent US3491397A successfully refreshed from Google Patents.
US3491397A
Expired / Lapsed
US
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Cleaning device having sponge-like cleaning block
Assignee: Individual
•
Filing: 1966-08-01
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Granted: 1970-01-27
•
Expires: 1986-08-01
Abstract
No abstract record available.
Inventors
- 👤 Walter Hesener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
A; A47; A47L; A47L17/00; A47L13/00; A47L13/10; A47L13/20; A47L13/24; A47L13/254; A47L13/257; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32549; Y10T403/32557; Y10T403/32591; Y10T403/32606; Y10T403/32951
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US546893A
Cited
US580003A
Cited
US686984A
Cited
US1120812A
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US1683871A
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FR654901A
Cited
US2171308A
Cited
US2138010A
Cited
US2446183A
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US2501289A
Cited
FR1153007A
Cited
US2998614A
Cited
GB893496A
Cited
AT220782B
Cited
US3225375A
Cited
US3353203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |