US3454828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoionization detector for gases and vapors
Assignee: Hitachi Ltd
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Filing: 1966-07-21
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Granted: 1969-07-08
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Expires: 1986-07-21
Abstract
No abstract record available.
Inventors
- 👤 Mikiya Yamane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:32
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/06; G; G01; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66; G01N27/68
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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |