US3370402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for cleaning contaminated gas
Assignee: Kanagawa Prefecture
•
Filing: 1966-05-06
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Granted: 1968-02-27
•
Expires: 1986-05-06
Abstract
No abstract record available.
Inventors
- 👤 Nakai Yoshiyuki
- 👤 Yokogawa Tetsuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D50/00; B01D50/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US970654A
Cited
US1897725A
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US2043109A
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US2430861A
Cited
US2452859A
Cited
US2573491A
Cited
GB883577A
Cited
US3050919A
Cited
US3282047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |