US3420012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevated floor system
Assignee: ERNEST C LISKEY JR
•
Filing: 1966-09-01
•
Granted: 1969-01-07
•
Expires: 1986-09-01
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Liskey Jr
- 👤 Richard W Custer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:04
CPC Classifications
E; E04; E04F; E04F15/00; E04F15/02; E04F15/024; E04F15/02447; E04F15/02452; E04F15/02405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1009340A
Cited
US2830332A
Cited
US3157254A
Cited
US3150748A
Cited
FR1335886A
Cited
US3258892A
Cited
US3339504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |