US2575698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum exhaust
Assignee: Individual
•
Filing: 1948-03-19
•
Granted: 1951-11-20
•
Expires: 1968-03-19
Abstract
No abstract record available.
Inventors
- 👤 John H Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:58
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE369209C
Cited
US717356A
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US714077A
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US818951A
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FR643075A
Cited
US2382218A
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US2462450A
Cited
US2466525A
Cited
US2543024A
Cited
US2522883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |