Patent US3513804A successfully refreshed from Google Patents.
US3513804A
Expired / Lapsed
US
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Kingpin location indicator for a collapsible trailer hitch
Assignee: ACF Industries Inc
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Filing: 1968-10-08
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Granted: 1970-05-26
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Expires: 1988-10-08
Abstract
No abstract record available.
Inventors
- 👤 Richard P Yeates
- 👤 Boris S Terlecky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:02
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/001; B61D45/004; B61D45/005; Y; Y10; Y10T; Y10T403/00; Y10T403/16; Y10T403/1616; Y10T403/1624; Y10T403/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3050320A
Cited
US3190595A
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US3268250A
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US3358955A
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US3424107A
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US3444825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |