Patent US3444512A successfully refreshed from Google Patents.
US3444512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway signal apparatus
Assignee: RAILROAD ACCESSORIES CORP
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Filing: 1966-02-28
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Granted: 1969-05-13
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Willard O Reinitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:11
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24; E; E01; E01F; E01F9/00; E01F9/60; E01F9/696
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1354981A
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US1366131A
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US1378421A
Cited
US2219757A
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US2512496A
Cited
US2694540A
Cited
US2665525A
Cited
US2950109A
Cited
FR1206324A
Cited
US3321160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |