US3397547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Avoidance of explosion hazards in air fractionation by halogenated hydrocarbon additin
Assignee: Union Carbide Corp
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Filing: 1967-12-14
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Granted: 1968-08-20
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Expires: 1987-12-14
Abstract
No abstract record available.
Inventors
- 👤 Erb Ezra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04763; F25J3/04769; F25J3/04854; F25J3/0486; F25J3/04406; F25J3/04412; F25J5/00; F25J5/002; F25J5/005; F25J2250/00; F25J2250/02; F25J2250/04; F25J2290/00; F25J2290/10; F25J2290/90; Y; Y10; Y10S; Y10S62/00; Y10S62/916
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) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |