US2489879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal responsive venetian blind
Assignee: Individual
•
Filing: 1945-10-22
•
Granted: 1949-11-29
•
Expires: 1965-10-22
Abstract
No abstract record available.
Inventors
- 👤 John J Grebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
E; E05; E05F; E05F1/00; E05F1/002; E05F1/004; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US585009A
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US1133089A
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US1358193A
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US1478516A
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US1827530A
Cited
GB400712A
Cited
US2149481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |