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US2647477A
Expired / Lapsed
US
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Vent protecting and draft equalizing device
Assignee: Lone Star Gas Co
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Filing: 1950-08-04
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Granted: 1953-08-04
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Expires: 1970-08-04
Abstract
No abstract record available.
Inventors
- 👤 Martin James Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:17
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/001; F24C15/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US181936A
Cited
DE563161C
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US686393A
Cited
US1397739A
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US1718226A
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US2087983A
Cited
CH225519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |