Patent US3421187A successfully refreshed from Google Patents.
US3421187A
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Assignee: Illinois Tool Works Inc
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Filing: 1966-10-13
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Granted: 1969-01-14
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Expires: 1986-10-13
Abstract
No abstract record available.
Inventors
- 👤 Francis E Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:42
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/22; F16L3/223; F16L3/2235; Y; Y10; Y10T; Y10T403/00; Y10T403/71; Y10T403/7129; Y10T403/7141
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1051245A
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US2144755A
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US2396925A
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GB588003A
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US3050578A
Cited
US3090826A
Cited
US3088702A
Cited
US3074675A
Cited
US3204636A
Cited
GB952425A
Cited
FR1311393A
Cited
FR1425659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |