Patent US2920525A successfully refreshed from Google Patents.
US2920525A
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US
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Apparatus for automatically counting and sizing airborne particles
Assignee: Individual
•
Filing: 1956-08-13
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Granted: 1960-01-12
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Expires: 1976-08-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur V Appel
- 👤 Howard T Betz
- 👤 Morris A Fisher
- 👤 Edward G Fochtman
- 👤 Lieberman Alvin
- 👤 Nelson E Alexander
- 👤 James L Murphy
- 👤 Daine C Maxwell
- 👤 Robert E Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255; G06; G06M; G06M11/00; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2775159A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |