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US3526428A
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Ventilation for a vehicle with a roll frame
Assignee: Dr Ing HCF Porsche AG
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Filing: 1968-03-29
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Granted: 1970-09-01
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Expires: 1988-03-29
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand Anton Ernst Porsche
- 👤 Wolfgang Eyb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:58
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/24; B60H1/248; B60R; B60R21/00; B60R21/02; B60R21/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1139244A
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US1588654A
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US1706026A
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US1804264A
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US2023699A
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US3059561A
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US3136239A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |