Patent US2520504A successfully refreshed from Google Patents.
US2520504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric printing
Assignee: WILLIAM C HUEBNER
•
Filing: 1944-11-22
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Granted: 1950-08-29
•
Expires: 1964-11-22
Abstract
No abstract record available.
Inventors
- 👤 William J Hooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/42; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE301508C
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US1600842A
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US1820194A
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US1838218A
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CH176469A
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US2173032A
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US2065136A
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US2152077A
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US2224391A
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US2451288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |