Patent US2893506A successfully refreshed from Google Patents.
US2893506A
Expired / Lapsed
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Door controlling linkage
Assignee: National Pneumatic Co Inc
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Filing: 1958-03-11
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Granted: 1959-07-07
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Expires: 1978-03-11
Abstract
No abstract record available.
Inventors
- 👤 Daugirdas Kristupas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:43
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/40; E05F17/00; E05F17/004; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/43; E05Y2201/434; E05Y2400/00; E05Y2400/10; E05Y2400/32; E05Y2400/35; E05Y2400/354; E05Y2400/50; E05Y2400/51; E05Y2800/00; E05Y2800/73; E05Y2900/00; E05Y2900/50; E05Y2900/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2259579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |