Patent US2418474A successfully refreshed from Google Patents.
US2418474A
Expired / Lapsed
US
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Variable letter-spacing device for typewriters
Assignee: Individual
•
Filing: 1942-05-20
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Granted: 1947-04-08
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Expires: 1962-05-20
Abstract
No abstract record available.
Inventors
- 👤 William R Lockridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US966035A
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US1264589A
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GB307867A
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US2047733A
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US2111410A
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US2202565A
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US2198005A
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US2225356A
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US2237770A
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US2199556A
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US2246968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |