US3497328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of contaminated gases and the like
Assignee: WILLARD R CALVERT
•
Filing: 1966-04-26
•
Granted: 1970-02-24
•
Expires: 1986-04-26
Abstract
No abstract record available.
Inventors
- 👤 Willard R Calvert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:00
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; B01D; B01D46/00; B01D46/30; B01D46/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1836301A
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US2379195A
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US2519873A
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US2544214A
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US2550955A
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US2616829A
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GB666715A
Cited
US2609887A
Cited
US2719206A
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US2679540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |