US3461686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means to reduce starting torque requirements for large centrifugal compressors
Assignee: Worthington Corp
•
Filing: 1968-01-04
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Granted: 1969-08-19
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Expires: 1988-01-04
Abstract
No abstract record available.
Inventors
- 👤 Erik B Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/10; F25B49/00; F25B49/02; F25B49/022; F25B2500/00; F25B2500/26; F25B2600/00; F25B2600/02; F25B2600/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2274391A
Cited
US3232070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |