US2586442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic door operating mechanism
Assignee: ASTRA ENGINEERING Co
•
Filing: 1950-03-04
•
Granted: 1952-02-19
•
Expires: 1970-03-04
Abstract
No abstract record available.
Inventors
- 👤 Nils G Seagren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/611; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US647671A
Cited
US1115605A
Cited
US1037267A
Cited
US1865913A
Cited
US2133170A
Cited
US2276338A
Cited
US2298542A
Cited
US2368722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |