US2154996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calcium sulphite filled paper
Assignee: West Virginia Pulp and Paper Co
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Filing: 1938-06-24
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Granted: 1939-04-18
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Expires: 1958-06-24
Abstract
No abstract record available.
Inventors
- 👤 Francis G Rawling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:10
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67
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) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |