Patent US2574137A successfully refreshed from Google Patents.
US2574137A
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Assignee: AT&T Teletype Corp
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Filing: 1946-03-22
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Granted: 1951-11-06
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Expires: 1966-03-22
Abstract
No abstract record available.
Inventors
- 👤 Walter J Zenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:01
CPC Classifications
F; F16; F16H; F16H21/00; F16H21/10; F16H21/16; F16H21/18; F16H21/20; F16H21/22; F16H21/26; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18176; Y10T74/21; Y10T74/2142; Y10T74/2144; Y10T74/2148; Y10T74/2149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US733998A
Cited
US1830765A
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US1891902A
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US1846850A
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US1957556A
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US2123978A
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US2310720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |