US2978073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimetal brake drum
Assignee: Chicago Railway Equipment Co
•
Filing: 1957-04-01
•
Granted: 1961-04-04
•
Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Soddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:19
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/10; F16D2065/13; F16D2065/1304; F16D2065/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1010789A
Cited
US1394402A
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US1989211A
Cited
US2105323A
Cited
US2062394A
Cited
US2292662A
Cited
US2382570A
Cited
GB560903A
Cited
US2462139A
Cited
US2840195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |