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US2948469A
Expired / Lapsed
US
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Apparatus for counting particles
Assignee: Coal Industry Patents Ltd
•
Filing: 1955-08-08
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Granted: 1960-08-09
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Expires: 1975-08-08
Abstract
No abstract record available.
Inventors
- 👤 Phillips James William
- 👤 Thomas David Gurney Arnold
- 👤 Walton William Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
G; G06; G06M; G06M11/00; G06M11/02; G06M11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2494441A
Cited
US2791697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |