US2421920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article handling apparatus
Assignee: AT&T Inc
•
Filing: 1943-11-06
•
Granted: 1947-06-10
•
Expires: 1963-11-06
Abstract
No abstract record available.
Inventors
- 👤 Elmer E Barkstrom
- 👤 Everett J Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:42
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US674685A
Cited
US782888A
Cited
US1139558A
Cited
US1252561A
Cited
US2043763A
Cited
US2088117A
Cited
US2075050A
Cited
US2269838A
Cited
US2317009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |