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Patent US3050286A successfully refreshed from Google Patents.
US3050286A
Expired / Lapsed
US
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Pulley block
Assignee: Boston & Lockport Block Co
•
Filing: 1957-09-18
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Granted: 1962-08-21
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Expires: 1977-09-18
Abstract
No abstract record available.
Inventors
- 👤 Donald C Seamans
- 👤 Wyatt O Ingalls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/04; B66D2700/00; B66D2700/02; B66D2700/026; B66D2700/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1359046A
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US1674071A
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US2359027A
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US2502860A
Cited
US2568512A
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US2775418A
Cited
US2873519A
Cited
US2861849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |