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Patent US2807807A successfully refreshed from Google Patents.
US2807807A
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Sediment prevention means
Assignee: HARGIVYS Inc
•
Filing: 1955-04-11
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Granted: 1957-10-01
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Expires: 1975-04-11
Abstract
No abstract record available.
Inventors
- 👤 Roscoe H Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:59
CPC Classifications
E; E03; E03D; E03D9/00; E03D9/02; E03D9/03; E03D9/033; E03D9/038; E03D2009/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2473822A
Cited
US300636A
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GB281853A
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US2025503A
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US2019665A
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US2328018A
Cited
US2192605A
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US2521802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |