US3500450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for the examination of smoke and dust laden gas
Assignee: Central Electricity Generating Board
•
Filing: 1966-06-23
•
Granted: 1970-03-10
•
Expires: 1986-06-23
Abstract
No abstract record available.
Inventors
- 👤 Edmund James Payton
- 👤 Colin Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:45
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US892241A
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US2242317A
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US1785392A
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US2513283A
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US2468740A
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US2498506A
Cited
US2624012A
Cited
US2654845A
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US2966092A
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US3170068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |