Patent US2333131A successfully refreshed from Google Patents.
US2333131A
Expired / Lapsed
US
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Pressure mold and process of molding
Assignee: American Optical Corp
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Filing: 1939-09-13
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Granted: 1943-11-02
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Expires: 1959-09-13
Abstract
No abstract record available.
Inventors
- 👤 Edgar D Tillyer
- 👤 Herbert E Hasenzahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:28
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/021; B29D; B29D11/00; B29D11/00009; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3618; B29K; B29K2909/00; B29K2909/02; B29K2909/08; B29L; B29L2011/00; B29L2011/0016; Y; Y10; Y10S; Y10S264/00; Y10S264/50; Y10S359/00; Y10S359/90; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-11-01 | 1947-05-03 | 1947-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-11-01 | 1951-05-03 | 1951-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-11-01 | 1955-05-03 | 1955-11-02 | $7700.00 | Window Closed / Lapsed |