US2040818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated diatomaceous earth product and method of making the same
Assignee: Johns Manville Corp
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Filing: 1932-07-29
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Granted: 1936-05-19
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Expires: 1952-07-29
Abstract
No abstract record available.
Inventors
- 👤 Marion S Badollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/12; C04B20/1018; C04B2111/00; C04B2111/00474; C04B2111/00793
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) | 1939-05-19 | 1939-11-18 | 1940-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-19 | 1943-11-18 | 1944-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-19 | 1947-11-18 | 1948-05-19 | $7700.00 | Window Closed / Lapsed |