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Patent US3521604A successfully refreshed from Google Patents.
US3521604A
Expired / Lapsed
US
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Vessel having a foam polyurethane outer layer
Assignee: AO Smith Corp
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Filing: 1968-01-29
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Granted: 1970-07-28
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Expires: 1988-01-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Nickel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:59
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1271; B29C44/04; B29C44/0407; B32; B32B; B32B15/00; B32B15/04; B32B15/08; F; F16; F16L; F16L59/00; F16L59/14; F24; F24H; F24H1/00; F24H1/18; F24H1/181; F24H1/182; Y; Y10; Y10S; Y10S220/00; Y10S220/902; Y10S264/00; Y10S264/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2099740A
Cited
US3275798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |