Patent US3566021A successfully refreshed from Google Patents.
US2500228A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1946-03-30
•
Granted: 1950-03-14
•
Expires: 1966-03-30
Abstract
No abstract record available.
Inventors
- 👤 Harold E Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:38
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/04; F04D9/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1780679A
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US1927799A
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US2024133A
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US2189675A
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GB522269A
Cited
US2414158A
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US2330558A
Cited
GB545027A
Cited
US2301063A
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US2390204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |