Patent DE448936C successfully refreshed from Google Patents.
US2880449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hold open devices for double acting swinging doors
Assignee: BOMMER SPRING HINGE CO Inc
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Filing: 1956-09-24
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Granted: 1959-04-07
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Expires: 1976-09-24
Abstract
No abstract record available.
Inventors
- 👤 Frohlich Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:46
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/1246; E05F1/1253; Y; Y10; Y10S; Y10S16/00; Y10S16/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US987467A
Cited
US2786226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |