Patent US2839157A successfully refreshed from Google Patents.
US2839157A
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US
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Sand or earth filter for shelters
Assignee: Individual
•
Filing: 1956-07-31
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Granted: 1958-06-17
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Expires: 1976-07-31
Abstract
No abstract record available.
Inventors
- 👤 Schuster Siegfried Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
A; A62; A62B; A62B13/00; A62B23/00; A62B23/04; B; B01; B01D; B01D46/00; B01D46/30; E; E04; E04H; E04H9/00; E04H9/04; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; Y; Y10; Y10S; Y10S454/00; Y10S454/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1608678A
Cited
US964719A
Cited
US1538292A
Cited
US1895601A
Cited
CH210059A
Cited
DE864309C
Cited
GB753300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |