US2472151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalancing apparatus
Assignee: AT&T Inc
•
Filing: 1946-11-23
•
Granted: 1949-06-07
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Expires: 1966-11-23
Abstract
No abstract record available.
Inventors
- 👤 Waldemar C Ewaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:37
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/001; B23Q11/0017; Y; Y10; Y10T; Y10T408/00; Y10T408/91; Y10T408/92; Y10T409/00; Y10T409/30; Y10T409/309576; Y10T409/309688
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US204248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |