US3477606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane tank structures
Assignee: Conch International Methane Ltd
•
Filing: 1965-03-25
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Granted: 1969-11-11
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Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Schwendtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
B; B63; B63B; B63B25/00; B63B25/02; B63B25/08; B63B25/12; B63B25/16; F; F17; F17C; F17C3/00; F17C3/02; F17C3/025; F17C2201/00; F17C2201/01; F17C2201/0147; F17C2201/0157; F17C2203/00; F17C2203/03; F17C2203/0304; F17C2203/0329; F17C2203/0333; F17C2203/0354; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2223/04; F17C2223/042; F17C2223/046; F17C2223/047; F17C2270/00; F17C2270/01; F17C2270/0102; F17C2270/0105; Y; Y10; Y10S; Y10S220/00; Y10S220/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB860816A
Cited
GB860815A
Cited
AT213782B
Cited
US3079026A
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US3039418A
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GB898267A
Cited
US3224621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |