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Patent US3102603A successfully refreshed from Google Patents.
US3102603A
Expired / Lapsed
US
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Cement feeder for concrete mixing plants
Assignee: BUTLER BIN CO
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Filing: 1961-05-09
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Granted: 1963-09-03
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Expires: 1981-05-09
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
B; B28; B28C; B28C7/00; B28C7/04; B28C7/0422; B28C7/0445
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) | 1966-09-02 | 1967-03-04 | 1967-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-02 | 1971-03-04 | 1971-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-02 | 1975-03-04 | 1975-09-03 | $7700.00 | Window Closed / Lapsed |