US3453077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing microspheroidal silica
Assignee: WR Grace and Co
•
Filing: 1967-08-10
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Granted: 1969-07-01
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Expires: 1987-08-10
Abstract
No abstract record available.
Inventors
- 👤 James R Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J21/00; B01J21/06; B01J21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3095384A
Cited
US3243262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |