US2816725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell supports
Assignee: Boeing Co
•
Filing: 1954-09-24
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Granted: 1957-12-17
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Expires: 1974-09-24
Abstract
No abstract record available.
Inventors
- 👤 Wallace R Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:19
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/02; B; B64; B64D; B64D37/00; B64D37/02; B64D37/04; B64D37/06; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45602; Y10T24/45623; Y10T24/45628; Y10T24/45634
Claims Analysis
Total Claims: 0
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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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |