Patent US2999678A successfully refreshed from Google Patents.
US2999678A
Expired / Lapsed
US
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Auxiliary spring suspensions
Assignee: Heckethorn Manufacturing and Supply Co
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Filing: 1959-09-08
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Granted: 1961-09-12
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Expires: 1979-09-08
Abstract
No abstract record available.
Inventors
- 👤 John E Heckethorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
B; B60; B60G; B60G15/00; B60G15/02; B60G15/06; B60G15/062; B60G15/063; F; F16; F16F; F16F9/00; F16F9/32; F16F9/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB422686A
Cited
US2660449A
Cited
US2765877A
Cited
US2690786A
Cited
GB719661A
Cited
US2823915A
Cited
US2896938A
Cited
US2874955A
Cited
GB811556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |