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Patent US3507239A successfully refreshed from Google Patents.
US3507239A
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Semisubmersible floating sea platform
Assignee: SCHEEPSBOUWBELANGEN NV
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Filing: 1968-07-01
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Granted: 1970-04-21
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Expires: 1988-07-01
Abstract
No abstract record available.
Inventors
- 👤 Johannes Wipkink
- 👤 Marinus Van Holst
- 👤 Johan Gerhard Wolters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:41
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/44; B63B35/4413; B63B1/00; B63B1/02; B63B1/10; B63B1/107; E; E02; E02B; E02B17/00; E02B17/0004; E04; E04B; E04B1/00; E04B1/18; E04B1/19; E04B1/1903; F; F16; F16B; F16B7/00; E04B1/1906; E04B2001/1924; E04B2001/1927; E04B2001/1957; E04B2001/1972; E04B2001/1981; E04B2001/1993; Y; Y10; Y10T; Y10T403/00; Y10T403/34; Y10T403/341; Y10T403/342; Y10T403/343; Y10T403/347
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) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |