Patent US3021386A successfully refreshed from Google Patents.
US3021386A
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US
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Boiler port viewing system
Assignee: General Electric Co
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Filing: 1960-03-30
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Granted: 1962-02-13
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Expires: 1980-03-30
Abstract
No abstract record available.
Inventors
- 👤 Richard J Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:34
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/18; H04N7/183; G; G01; G01J; G01J5/00; G01J5/02; G01J5/0205; G01J5/07; G01J5/08; G01J5/0806; G01J5/0818; G01J5/084; G01J5/0859; G01J5/0893
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |