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Patent US2421764A successfully refreshed from Google Patents.
US2421764A
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US
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Affixing characters to transparent drums
Assignee: Wells Gardner & Co
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Filing: 1944-10-23
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Granted: 1947-06-10
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Expires: 1964-10-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Swallow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:01
CPC Classifications
B; B44; B44C; B44C1/00; B44C1/16; B41; B41F; B41F17/00; B41F17/08; B41F17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US270342A
Cited
US320784A
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US1752371A
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US1715920A
Cited
GB368405A
Cited
US1958588A
Cited
US2158633A
Cited
US2331087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |