US3453988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable flooring spreader
Assignee: Shell USA Inc
•
Filing: 1967-10-09
•
Granted: 1969-07-08
•
Expires: 1987-10-09
Abstract
No abstract record available.
Inventors
- 👤 James A Trent
- 👤 Hans E Kubitschek
- 👤 Harvey E Hook
- 👤 Fred H Caudel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:22
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/48; E01C19/4866
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA508725A
Cited
US893168A
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US1388690A
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US2185645A
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US2248247A
Cited
US2473961A
Cited
US2592960A
Cited
US2664794A
Cited
GB751288A
Cited
BE544750A
Cited
US3000277A
Cited
US3161115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |