US3608251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Upper row lock linkage
Assignee: American Seating Co
•
Filing: 1970-06-12
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Granted: 1971-09-28
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Expires: 1990-06-12
Abstract
Abstract THE UPPER ROWS PARTICULARLY OF POST-SUPPORTED TELESCOPING PLATFORMS, SUCH AS BLEACHERS AND THE LIKE, ARE AUTOMATICALLY LOCKED AND BRACED BY LINKAGE BETWEEN THE POSTS WHEN THE POSTS ARE OPENED TO EXPANDED POSITION AND AUTOMATICALLY UNLOCKED AS THE PLATFORMS ARE MOVED ONE BY ONE TO CLOSED POSITION.
Inventors
- 👤 Robert T Scaggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:10
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/12; E04H3/123
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |