US2217074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calling device
Assignee: Associated Electric Laboratories Inc
•
Filing: 1939-02-24
•
Granted: 1940-10-08
•
Expires: 1959-02-24
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Obergfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:21
CPC Classifications
F; F16; F16D; F16D41/00; F16D41/12; G; G10; G10K; G10K1/00; G10K1/06; G10K1/07; H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/31; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; 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) | 1943-10-08 | 1944-04-08 | 1944-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-08 | 1948-04-08 | 1948-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-08 | 1952-04-08 | 1952-10-08 | $7700.00 | Window Closed / Lapsed |