US3503472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extendable support column
Assignee: ZF Friedrichshafen AG
•
Filing: 1968-02-23
•
Granted: 1970-03-31
•
Expires: 1988-02-23
Abstract
No abstract record available.
Inventors
- 👤 Ludwig Axthammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:28
CPC Classifications
A; A47; A47B; A47B9/00; A47B9/10; F; F16; F16F; F16F9/00; F16F9/32; F16F9/56; Y; Y10; Y10S; Y10S277/00; Y10S277/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1754764A
Cited
US2042443A
Cited
US2117837A
Cited
US2678114A
Cited
US2752149A
Cited
US2729440A
Cited
US3300202A
Cited
US3376957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |