US1827103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential widening means
Assignee: Penn Electric Switch Co
•
Filing: 1929-01-28
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Granted: 1931-10-13
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Expires: 1949-01-28
Abstract
No abstract record available.
Inventors
- 👤 Penn Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; Y; Y10; Y10S; Y10S200/00; Y10S200/27; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/18896; Y10T74/21; Y10T74/2142; Y10T74/2162
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) | 1934-10-12 | 1935-04-13 | 1935-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-12 | 1939-04-13 | 1939-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-12 | 1943-04-13 | 1943-10-13 | $7700.00 | Window Closed / Lapsed |