Patent US3500620A successfully refreshed from Google Patents.
US3500620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lawnmower construction
Assignee: Black and Decker Corp
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Filing: 1967-05-05
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Granted: 1970-03-17
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Expires: 1987-05-05
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Duran
- 👤 William R Lessig
- 👤 Henry J Stielper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:42
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/412; A01D34/63; A01D2101/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1674258A
Cited
US3230695A
Cited
US3068631A
Cited
US3298163A
Cited
US3272952A
Cited
DE1795021B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |