Patent US3550993A successfully refreshed from Google Patents.
US3550993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level regulated hydro-pneumatic spring suspension system for vehicles
Assignee: Langen and Co
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Filing: 1968-10-22
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Granted: 1970-12-29
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Expires: 1988-10-22
Abstract
No abstract record available.
Inventors
- 👤 Joachim Peiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:08
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/005; B60G17/02; B60G17/033; B60G17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |