US2887227A
Expired / Lapsed
US
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Dust particle counting apparatus
Assignee: General Electric Co
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Filing: 1955-12-27
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Granted: 1959-05-19
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Expires: 1975-12-27
Abstract
No abstract record available.
Inventors
- 👤 Stuart B Dunham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:28
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/04; B; B01; B01D; B01D21/00; B01D21/02; B01D21/24; B01D21/30; B01D21/302; B01D21/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |