US3516513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for leveling self-frecting platform structures
Assignee: Baldwin Lima Hamilton Corp
•
Filing: 1968-04-22
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Granted: 1970-06-23
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Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 Dean S Robertson
- 👤 Carroll V Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:54
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/14; E04G21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235246A
Cited
US3031997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |