Patent US2993652A successfully refreshed from Google Patents.
Patent US1999210A successfully refreshed from Google Patents.
US1999210A
Expired / Lapsed
US
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Hydrous silicate gels and method of making the same
Assignee: Johns Manville Corp
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Filing: 1931-04-10
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Granted: 1935-04-30
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Expires: 1951-04-10
Abstract
No abstract record available.
Inventors
- 👤 Rembert Ernest Wayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/22; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/12; C01B33/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-04-29 | 1938-10-29 | 1939-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-29 | 1942-10-29 | 1943-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-29 | 1946-10-29 | 1947-04-30 | $7700.00 | Window Closed / Lapsed |