US2638639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frictionally controlled sliding window sash
Assignee: Individual
•
Filing: 1950-06-09
•
Granted: 1953-05-19
•
Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 Walton N Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:38
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/32; E06B3/50; E06B3/5054; E06B3/5063; E06B3/34; E06B3/42; E06B3/44; E06B2003/4438; E06B2003/4446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US166808A
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US451826A
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US452098A
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US554075A
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US906142A
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US1073956A
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US2288558A
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US2369402A
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US2334432A
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US2352171A
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US2397090A
Cited
US2564299A
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US2595595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |