US3447398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy transfer device
Assignee: Ingersoll Rand Co
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Filing: 1967-07-27
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Granted: 1969-06-03
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Expires: 1987-07-27
Abstract
No abstract record available.
Inventors
- 👤 Hsin Sheng Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:22
CPC Classifications
B; B25; B25B; B25B21/00; B25B21/02; F; F16; F16H; F16H33/00; F16H33/02; F16H2706/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |