Patent US4446395A successfully refreshed from Google Patents.
US3486592A
Expired / Lapsed
US
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Rail vehicle brake systems
Assignee: Becorit Grubenausbau GmbH
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Filing: 1968-04-12
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Granted: 1969-12-30
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Expires: 1988-04-12
Abstract
No abstract record available.
Inventors
- 👤 Theodor Kolk
- 👤 Wilhelm Wertelewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12; B60T7/126; F; F21; F21S; F21S41/00; F21S41/10; F21S41/14; F21S41/162; F21S41/164; F21S41/30; F21S41/32; F21S41/321; F21S41/33; F21S41/331; F21S41/333; F21S41/40; F21S41/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |