Patent US2574493A successfully refreshed from Google Patents.
US2574493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Classifier and separator
Assignee: Individual
•
Filing: 1949-04-18
•
Granted: 1951-11-13
•
Expires: 1969-04-18
Abstract
No abstract record available.
Inventors
- 👤 Mclean Lyle Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:29
CPC Classifications
B; B03; B03B; B03B4/00; B03B4/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US895363A
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US1534846A
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US1822840A
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US1831524A
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US2007190A
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US2086584A
Cited
GB455219A
Cited
US2074977A
Cited
US2275849A
Cited
US2303367A
Cited
US2332183A
Cited
US2445251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |