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US2811389A
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Tamper-proof proportioner and dispenser
Assignee: Fischer Industries Inc
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Filing: 1956-05-31
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Granted: 1957-10-29
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Expires: 1976-05-31
Abstract
No abstract record available.
Inventors
- 👤 Fischer Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:11
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86292; Y10T137/86324; Y10T137/87571; Y10T137/87587; Y10T137/87643
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1887371A
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US2010661A
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CH140964A
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US1854282A
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US1908707A
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US2039275A
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US2233965A
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US2530357A
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US2737413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |