US3480408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalic anhydride reactor
Assignee: Foster Wheeler Inc
•
Filing: 1967-05-15
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Granted: 1969-11-25
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Expires: 1987-05-15
Abstract
No abstract record available.
Inventors
- 👤 Henry N Lacroix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:35
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B; B01; B01J; B01J8/00; B01J8/005; B01J8/006; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2428914A
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US2458960A
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US2394710A
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US2391534A
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US2585274A
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US2453740A
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US2474583A
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US3055745A
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US2903419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |