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US2680035A
Expired / Lapsed
US
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Spring sash balancer
Assignee: Individual
•
Filing: 1951-04-27
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Granted: 1954-06-01
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Expires: 1971-04-27
Abstract
No abstract record available.
Inventors
- 👤 Christopher C Amy
- 👤 Harry B Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:05
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/32; E06B3/34; E06B3/42; E06B3/44; E06B2003/4438; E06B2003/4446; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0876; Y10T292/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |