US3521904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle structure
Assignee: LAWRENCE E SHEFFER
•
Filing: 1968-03-20
•
Granted: 1970-07-28
•
Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Sheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
B; B62; B62K; B62K21/00; B62K21/005; B62K21/18; B62K21/20; B62K25/00; B62K25/04; B62K25/28; B62K25/283; B62K3/00; B62K3/02; B62M; B62M7/00; B62M7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US444639A
Cited
US1527905A
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US1803055A
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US2025040A
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US2210485A
Cited
GB558387A
Cited
US2401869A
Cited
US2542363A
Cited
US2622896A
Cited
US3022992A
Cited
US3202236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |