US2777393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for maintaining a predetermined quantity of liquid in a closed space
Assignee: Individual
•
Filing: 1951-02-12
•
Granted: 1957-01-15
•
Expires: 1971-02-12
Abstract
No abstract record available.
Inventors
- 👤 Ben H Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:10
CPC Classifications
A; A23; A23G; A23G9/00; A23G9/04; A23G9/20; Y; Y10; Y10T; Y10T137/00; Y10T137/2931
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1201660A
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US1644378A
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US1508969A
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US1786231A
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US1865561A
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US1885926A
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US2116636A
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US2161510A
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US2219656A
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US2381821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |