US3494875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous silica bodies and method
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1968-04-16
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Granted: 1970-02-10
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Expires: 1988-04-16
Abstract
No abstract record available.
Inventors
- 👤 Madeleine Le Page
- 👤 Germaine Pineau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:49
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J21/00; B01J21/06; B01J21/08; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157
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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |