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US2904809A
Expired / Lapsed
US
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Fountain sponges
Assignee: Individual
•
Filing: 1955-04-11
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Granted: 1959-09-22
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Clayson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:12
CPC Classifications
A; A47; A47L; A47L17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1592430A
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US1831586A
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US1888061A
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US1829287A
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US2132459A
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US2254235A
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US2320964A
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US2460407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |