Patent US2923491A successfully refreshed from Google Patents.
US2923491A
Expired / Lapsed
US
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Spring balancer drum
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1957-04-05
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Granted: 1960-02-02
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Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 Howard R Fischer
- 👤 Haem Marcel P D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:17
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/28; B; B25; B25H; B25H1/00; B25H1/0021; B25H1/0028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2072582A
Cited
US2204938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |