Patent US1686583A successfully refreshed from Google Patents.
Patent US2989979A successfully refreshed from Google Patents.
US2989979A
Expired / Lapsed
US
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Chemical feeders
Assignee: Individual
•
Filing: 1957-11-06
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Granted: 1961-06-27
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Expires: 1977-11-06
Abstract
No abstract record available.
Inventors
- 👤 Wesley N Karlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:47
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688; B; B01; B01F; B01F21/00; B01F21/20; B01F21/22; B01F25/00; B01F25/30; B01F25/31; B01F25/316; Y; Y10; Y10T; Y10T137/00; Y10T137/4891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1409248A
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US1423657A
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US1855323A
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US1834172A
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US2532973A
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US2536361A
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US2609232A
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US2627977A
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US2703176A
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US2714963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |