Patent US3444892A successfully refreshed from Google Patents.
US3444892A
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Dispensing device for metering the flow of particulate materials
Assignee: NL Chemicals Inc
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Filing: 1966-06-09
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Granted: 1969-05-20
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Expires: 1986-06-09
Abstract
No abstract record available.
Inventors
- 👤 George W Doyle
- 👤 Robert A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:18
CPC Classifications
G; G01; G01F; G01F13/00; G01F13/006; G05; G05D; G05D7/00; G05D7/06; G05D7/0605; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86421
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2328805A
Cited
US2738159A
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DE1048454B
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US2895548A
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US3188302A
Cited
US3059898A
Cited
US3101159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |