US2439393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronized control unit
Assignee: Individual
•
Filing: 1945-08-03
•
Granted: 1948-04-13
•
Expires: 1965-08-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
G; G05; G05G; G05G9/00; G05G9/08; G05G2700/00; G05G2700/22; G05G2700/26; G05G2700/30; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE527508C
Cited
US1869326A
Cited
US1807848A
Cited
US1889295A
Cited
US2235013A
Cited
US2313768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |