Patent US3473503A successfully refreshed from Google Patents.
US3473503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-supported marine vehicle
Assignee: Individual
•
Filing: 1968-02-07
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Granted: 1969-10-21
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Expires: 1988-02-07
Abstract
No abstract record available.
Inventors
- 👤 Fred C Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:33
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/32; B63B1/34; B63B1/38; B60; B60V; B60V1/00; B60V1/04; B60V1/046; B60V1/14; B60V1/145; B60V3/00; B60V3/06; B60V3/065; Y; Y02; Y02T; Y02T70/00; Y02T70/10
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) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |