Patent US940453A successfully refreshed from Google Patents.
US940453A
Expired / Lapsed
US
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Check-valve for locomotive-boilers and the like.
Assignee: Individual
•
Filing: 1907-03-19
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Granted: 1909-11-16
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Expires: 1927-03-19
Abstract
No abstract record available.
Inventors
- 👤 Theodore Robert Fondren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:33
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6855; Y10T137/6858; Y10T137/6862; Y10T137/8593; Y10T137/87169; Y10T137/877; Y10T137/87901; Y10T137/87917; Y10T137/88054
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) | 1912-11-15 | 1913-05-17 | 1913-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-11-15 | 1917-05-17 | 1917-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-11-15 | 1921-05-17 | 1921-11-16 | $7700.00 | Window Closed / Lapsed |