Patent US1988044A successfully refreshed from Google Patents.
Patent US2519503A successfully refreshed from Google Patents.
US2519503A
Expired / Lapsed
US
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Lighting and ventilating apparatus
Assignee: Individual
•
Filing: 1948-06-10
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Granted: 1950-08-22
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Expires: 1968-06-10
Abstract
No abstract record available.
Inventors
- 👤 Victor A Rigaumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US988157A
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US1684474A
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US1786969A
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US2196391A
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US2201312A
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US2124801A
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US2282587A
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US2255849A
Cited
US2365867A
Cited
US2369119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |