Patent US1991371A successfully refreshed from Google Patents.
Patent US2682918A successfully refreshed from Google Patents.
US2682918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cushion
Assignee: Individual
•
Filing: 1952-05-10
•
Granted: 1954-07-06
•
Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 James H Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:36
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/38; A47C7/383; A47C7/02; A47C7/021; A47C7/40; A47C7/42; A47C7/425
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |