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US3423363A
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Formaldehyde polymerization process and apparatus
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1964-12-09
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Granted: 1969-01-21
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Francis Fournel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:47
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/12; C08G2/14; C08G2/16; C08G2/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3233981A
Cited
US2951059A
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US2982758A
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US3215505A
Cited
US3118859A
Cited
FR1285909A
Cited
US3285877A
Cited
US3281395A
Cited
US3296205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |