US2989780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming thermoplastic sheets
Assignee: Emhart Manufacturing Co
•
Filing: 1953-07-02
•
Granted: 1961-06-27
•
Expires: 1973-07-02
Abstract
No abstract record available.
Inventors
- 👤 Sanford S Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:54
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/04; Y; Y10; Y10S; Y10S425/00; Y10S425/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23171E
Cited
US2513785A
Cited
US2493439A
Cited
US2568129A
Cited
US2559705A
Cited
US2690593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |