Patent US3521437A successfully refreshed from Google Patents.
US3521437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mowing device
Assignee: Unisys Corp
•
Filing: 1968-08-21
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Granted: 1970-07-21
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Expires: 1988-08-21
Abstract
No abstract record available.
Inventors
- 👤 Roger L Risser
- 👤 Allison W Blanshine
- 👤 Horace G Mccarty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:10
CPC Classifications
F; F28; F28F; F28F25/00; F28F25/02; F28F25/08; F28F25/082; A; A01; A01D; A01D34/00; A01D34/01; A01D34/02; A01D34/13
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) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |