Patent US2789765A successfully refreshed from Google Patents.
US2789765A
Expired / Lapsed
US
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Apparatus for counting and measuring particles
Assignee: National Coal Board
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Filing: 1951-04-23
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Granted: 1957-04-23
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Expires: 1971-04-23
Abstract
No abstract record available.
Inventors
- 👤 Gillings David William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
G; G06; G06M; G06M11/00; G06M11/02; G06M11/04; H; H03; H03K; H03K21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2037044A
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US2369577A
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US2360883A
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US2333791A
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US2472542A
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US2494441A
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US2584052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |