Patent US2990837A successfully refreshed from Google Patents.
US2990837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inflatable structure
Assignee: Individual
•
Filing: 1959-03-26
•
Granted: 1961-07-04
•
Expires: 1979-03-26
Abstract
No abstract record available.
Inventors
- 👤 Walton W Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:02
CPC Classifications
E; E04; E04H; E04H15/00; E04H15/20; E04H2015/202; E04H2015/204
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US468455A
Cited
US2652845A
Cited
US2689812A
Cited
US2718014A
Cited
GB791695A
Cited
GB801950A
Cited
GB793984A
Cited
US2939467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |