Patent US3767330A successfully refreshed from Google Patents.
US2280488A
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Method and apparatus for making stonelike units
Assignee: Johns Manville Corp
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Filing: 1939-02-20
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Granted: 1942-04-21
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Expires: 1959-02-20
Abstract
No abstract record available.
Inventors
- 👤 Edward M Jenkins
- 👤 Rembert Ernest Wayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:12
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/40; B28B7/46; B28B1/00; B28B1/005; B28B1/52; B28B13/00; B28B13/02; B28B13/0215; B28B13/022; C; C04; C04B; C04B40/00; C04B40/0028
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) | 1945-04-20 | 1945-10-20 | 1946-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-20 | 1949-10-20 | 1950-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-20 | 1953-10-20 | 1954-04-21 | $7700.00 | Window Closed / Lapsed |