US2250453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Successive switching arrangement
Assignee: Houdry Process Corp
•
Filing: 1938-07-12
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Granted: 1941-07-29
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Expires: 1958-07-12
Abstract
No abstract record available.
Inventors
- 👤 Henry J Appel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:27
CPC Classifications
H; H02; H02J; H02J13/00; G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/06; G05B19/063; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0629; G05D7/0635; G05D7/0641; H01; H01H; H01H43/00; H01H43/24; H02J13/16; H02J13/18; H02J13/34; H02P; H02P1/00; H02P1/16; H02P1/54; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y04; Y04S; Y04S20/00; Y10; Y10T; Y10T137/00; Y10T137/8376; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86421; Y10T137/86429
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) | 1944-07-28 | 1945-01-27 | 1945-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-28 | 1949-01-27 | 1949-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-28 | 1953-01-27 | 1953-07-29 | $7700.00 | Window Closed / Lapsed |