US2687767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring cushion structure
Assignee: Individual
•
Filing: 1951-02-23
•
Granted: 1954-08-31
•
Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
- 👤 William A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/04; A47C27/06; A47C27/063; B; B60; B60N; B60N2/00; B60N2/70; B60N2/7023; B60N2/7035
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1270841A
Cited
US1664934A
Cited
US2144102A
Cited
US2180500A
Cited
US2265901A
Cited
US2247543A
Cited
US2308772A
Cited
US2281902A
Cited
US2540927A
Cited
US2568055A
Cited
US2526183A
Cited
US2611423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |