US2133469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calling device
Assignee: Associated Electric Laboratories Inc
•
Filing: 1936-09-05
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Granted: 1938-10-18
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Expires: 1956-09-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Obergfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:23
CPC Classifications
F; F16; F16D; F16D41/00; F16D41/12; H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/31; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1566; Y10T74/1568; Y10T74/1569; Y10T74/20; Y10T74/20576; Y10T74/20732; Y10T74/20834; Y10T74/2084; Y10T74/21; Y10T74/2133; Y10T74/2135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-10-17 | 1942-04-18 | 1942-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-17 | 1946-04-18 | 1946-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-17 | 1950-04-18 | 1950-10-18 | $7700.00 | Window Closed / Lapsed |