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US1023530A
Expired / Lapsed
US
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Combined smoke and ventilation shaft.
Assignee: Individual
•
Filing: 1910-10-14
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Granted: 1912-04-16
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Expires: 1930-10-14
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Schofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:11
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1915-04-16 | 1915-10-16 | 1916-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1919-04-16 | 1919-10-16 | 1920-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1923-04-16 | 1923-10-16 | 1924-04-16 | $7700.00 | Window Closed / Lapsed |