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US3496586A
Expired / Lapsed
US
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Portable bridges
Assignee: Griffolyn Co Inc
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Filing: 1968-05-06
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Granted: 1970-02-24
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Expires: 1988-05-06
Abstract
No abstract record available.
Inventors
- 👤 William A Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:39
CPC Classifications
E; E01; E01D; E01D15/00; E01D15/14; E01D15/20; B; B63; B63B; B63B35/00; B63B35/34; B63B35/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2527995A
Cited
US2650194A
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US2924191A
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US3090339A
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US3147727A
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US3340553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |