Patent US2446782A successfully refreshed from Google Patents.
US2446782A
Expired / Lapsed
US
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Manufacture of cementitious sheets
Assignee: Johns Manville Corp
•
Filing: 1946-01-26
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Granted: 1948-08-10
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Expires: 1966-01-26
Abstract
No abstract record available.
Inventors
- 👤 Harold J Otis
- 👤 Hesse Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; B28B1/521
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1453382A
Cited
US1641874A
Cited
US2010425A
Cited
US1945003A
Cited
US2230880A
Cited
US2401663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |