US2933175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw-conveyor systems
Assignee: AT&T Inc
•
Filing: 1958-10-29
•
Granted: 1960-04-19
•
Expires: 1978-10-29
Abstract
No abstract record available.
Inventors
- 👤 Alvin N Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:49
CPC Classifications
B; B65; B65G; B65G33/00; B65G33/24; B65G33/34; B65G33/38; B29; B29C; B29C48/00; B29C48/03; B29C48/25; B29C48/285; B29C48/286; B29C48/36; B29C48/375; B29C48/39; B29C48/385
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1401155A
Cited
US2791802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |