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US2518894A
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Automatic changeover mechanism
Assignee: Union Carbide Corp
•
Filing: 1945-06-14
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Granted: 1950-08-15
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Expires: 1965-06-14
Abstract
No abstract record available.
Inventors
- 👤 Frank F Humbarger
- 👤 Ralph C Pierson
- 👤 Willis G Schepman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:52
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/04; F17C13/045; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569; Y10T137/4673; Y10T137/4857; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7822; Y10T137/783; Y10T137/7831; Y10T137/8158; Y10T137/8225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US986921A
Cited
US2168701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |