Patent US2939616A successfully refreshed from Google Patents.
US2939616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door structure for rubber mixers and the like
Assignee: Farrel Birmingham Co Inc
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Filing: 1958-01-21
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Granted: 1960-06-07
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Expires: 1978-01-21
Abstract
No abstract record available.
Inventors
- 👤 Warren C Whittum
- 👤 Douglas W Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:12
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/02; B29B7/22; B29B7/26; B29B7/263; B29B7/06; B29B7/10; B29B7/18; B29B7/183
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |