Patent US2679795A successfully refreshed from Google Patents.
US2679795A
Expired / Lapsed
US
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Breathershaft safety ventilating system
Assignee: Individual
•
Filing: 1950-05-24
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Granted: 1954-06-01
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Expires: 1970-05-24
Abstract
No abstract record available.
Inventors
- 👤 Geiger Josef
- 👤 Eugene J Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:43
CPC Classifications
A; A62; A62B; A62B13/00; E; E04; E04F; E04F17/00; E04F17/04; F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; Y; Y10; Y10S; Y10S454/00; Y10S454/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US332379A
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US381112A
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US472163A
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US921966A
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US1289856A
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FR506956A
Cited
GB298510A
Cited
US2014840A
Cited
FR793631A
Cited
US2120883A
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CH212657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |