Patent US2644557A successfully refreshed from Google Patents.
US2644557A
Expired / Lapsed
US
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Window structure
Assignee: Individual
•
Filing: 1950-01-10
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Granted: 1953-07-07
•
Expires: 1970-01-10
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Westman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:09
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/02; E06B7/08; E06B7/084; E05; E05F; E05F11/00; E05F11/02; E05F11/08; E05F11/12; E05F11/16; E05F11/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |