US2545549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety control for machines
Assignee: AT&T Inc
•
Filing: 1948-12-08
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Granted: 1951-03-20
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Expires: 1968-12-08
Abstract
No abstract record available.
Inventors
- 👤 Nat A L Guill
- 👤 Bror V Malmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/18; F16P3/20; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/872
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) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |