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US3370556A
Expired / Lapsed
US
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Mechanical counterbalance system
Assignee: Keuffel and Esser of Canada Ltd
•
Filing: 1966-10-25
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Granted: 1968-02-27
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Expires: 1986-10-25
Abstract
No abstract record available.
Inventors
- 👤 Kooi Johan Peter Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:49
CPC Classifications
A; A47; A47B; A47B27/00; A47B27/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123024A
Cited
US1859456A
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US2560928A
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US2710780A
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US2982050A
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US3140559A
Cited
US3213809A
Cited
US3273517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |