US3121920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for vacuum molding polymer sheets
Assignee: Phillips Petroleum Co
•
Filing: 1961-06-26
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Granted: 1964-02-25
•
Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Doyle Robert
- 👤 William L Holt
- 👤 Wayne E Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:35
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/42; B29C51/428; B29C33/00; B29C33/02; B29C33/04; B29C51/08; B29C2791/00; B29C2791/004; B29C2791/006; B29C51/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2517701A
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US2514718A
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US2579898A
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US2690593A
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US2915292A
Cited
US2793006A
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US2836852A
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US2867414A
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US2875985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |