US2550781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete aggregate feeder having a measuring rotor and an adjustable feed hopper
Assignee: Individual
•
Filing: 1946-12-09
•
Granted: 1951-05-01
•
Expires: 1966-12-09
Abstract
No abstract record available.
Inventors
- 👤 Richard R Colburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/46; B65G53/4608; B65G53/4616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US719237A
Cited
US1001367A
Cited
US2152632A
Cited
US2183547A
Cited
US2299565A
Cited
US2417700A
Cited
US2413293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |