Patent US2807835A successfully refreshed from Google Patents.
US2807835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door and housing therefor
Assignee: Cornell Research Foundation Inc
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Filing: 1954-06-08
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Granted: 1957-10-01
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Expires: 1974-06-08
Abstract
No abstract record available.
Inventors
- 👤 Weise Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:04
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/32; E06B3/50; E06B3/5045; E05; E05D; E05D15/00; E05D15/56; E05D15/58; E05Y; E05Y2900/00; E05Y2900/20; E05Y2900/212
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |