Patent US1934383A successfully refreshed from Google Patents.
US1934383A
Expired / Lapsed
US
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Process of making permeable ceramic products
Assignee: Johns Manville Corp
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Filing: 1931-05-21
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Granted: 1933-11-07
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Expires: 1951-05-21
Abstract
No abstract record available.
Inventors
- 👤 William L Stafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/0605; C04B2111/00; C04B2111/52; Y; Y10; Y10S; Y10S264/00; Y10S264/63
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) | 1936-11-06 | 1937-05-08 | 1937-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-06 | 1941-05-08 | 1941-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-06 | 1945-05-08 | 1945-11-07 | $7700.00 | Window Closed / Lapsed |