Patent US3512902A successfully refreshed from Google Patents.
Patent US2755729A successfully refreshed from Google Patents.
US2755729A
Expired / Lapsed
US
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Ventilation devices or louvers
Assignee: SCOTTISH ALUMINUM WARE Ltd
•
Filing: 1953-02-18
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Granted: 1956-07-24
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Expires: 1973-02-18
Abstract
No abstract record available.
Inventors
- 👤 Galbraith Alexander
- 👤 Cleiff John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:17
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/065; B; B64; B64D; B64D13/00; B64D2013/003; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32631; Y10T403/32811
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |