US2435934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signalling clinograph
Assignee: Individual
•
Filing: 1940-01-29
•
Granted: 1948-02-10
•
Expires: 1960-01-29
Abstract
No abstract record available.
Inventors
- 👤 Fred M Varney
- 👤 Justin A Varney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:33
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; E21B47/0236; Y; Y10; Y10T; Y10T29/00; Y10T29/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1313367A
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US1963090A
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US1970253A
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US1930832A
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US1979481A
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US1988741A
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US2046956A
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US2201311A
Cited
US2156519A
Cited
US2142559A
Cited
US2190141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-09 | 1951-08-11 | 1952-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-09 | 1955-08-11 | 1956-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-09 | 1959-08-11 | 1960-02-10 | $7700.00 | Window Closed / Lapsed |