Patent US3546740A successfully refreshed from Google Patents.
US3546740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm-type sheet forming apparatus
Assignee: Shell USA Inc
•
Filing: 1967-08-14
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Granted: 1970-12-15
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Expires: 1987-08-14
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:32
CPC Classifications
B; B21; B21D; B21D35/00; B21D35/002; B21D35/005; B21D35/006; B21D22/00; B21D22/10; B21D22/12; B29; B29C; B29C51/00; B29C51/26; B29C51/28; B30; B30B; B30B5/00; B30B5/02; B29C43/00; B29C43/02; B29C43/10; B29C43/12
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |