US2941776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalancing mechanism
Assignee: Ritter Co Inc
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Filing: 1957-05-13
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Granted: 1960-06-21
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Expires: 1977-05-13
Abstract
No abstract record available.
Inventors
- 👤 Norman E Lauterbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/02; F16M11/04; F16M11/06; F16M11/10; F16M11/20; F16M11/2007; F16M11/2014; F16M11/2092; F16M13/00; F16M13/02; F21; F21V; F21V21/00; F21V21/14; F21V21/26; F21V21/28; F16M2200/00; F16M2200/04; F16M2200/044; F16M2200/06; F16M2200/063; F16M2200/065
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) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |