US2640534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible supporting frame
Assignee: Individual
•
Filing: 1949-05-12
•
Granted: 1953-06-02
•
Expires: 1969-05-12
Abstract
No abstract record available.
Inventors
- 👤 Fredrick W Coffing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:53
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/20; E02B3/24; E04; E04F; E04F10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937730A
Cited
US2121395A
Cited
US2259903A
Cited
US2334749A
Cited
US2523929A
Cited
US2440972A
Cited
US2550913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |