Patent US2321938A successfully refreshed from Google Patents.
US2321938A
Expired / Lapsed
US
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Coating process
Assignee: Johns Manville Corp
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Filing: 1940-06-19
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Granted: 1943-06-15
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Expires: 1960-06-19
Abstract
No abstract record available.
Inventors
- 👤 Robert G Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:55
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/04; D21H25/06; D21H23/00; D21H23/02; D21H23/22; D21H23/70; D21H5/00; D21H5/0005; D21H5/005; D21J; D21J1/00
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) | 1946-06-14 | 1946-12-14 | 1947-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-06-14 | 1950-12-14 | 1951-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-06-14 | 1954-12-14 | 1955-06-15 | $7700.00 | Window Closed / Lapsed |