Patent US2930237A successfully refreshed from Google Patents.
US2930237A
Expired / Lapsed
US
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Flue gas sampling system
Assignee: Leeds and Northrup Co
•
Filing: 1956-06-19
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Granted: 1960-03-29
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Expires: 1976-06-19
Abstract
No abstract record available.
Inventors
- 👤 Jr George D Fowle
- 👤 Harry A Kraftson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:06
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2260794A
Cited
US2452224A
Cited
GB592818A
Cited
US2648976A
Cited
US2550933A
Cited
US2703015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |