US3708567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making epoxy spectacle frames using excess 1-cyclohexylamino-3-amino-propane curing agent
Assignee: Optyl Holding & Co Verwaltungs KG GmbH
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Filing: 1970-04-27
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Granted: 1973-01-02
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Expires: 1990-04-27
Abstract
Abstract A METHOD FOR THE MANUFACTUREE OF SPECTACLE FRAMES AND COMPONENTS THEREOF HAVING EXCELLENT FLEXURAL STRENGTH AND IMPACT STRENGTH. POLYEPOXIDES AND MIXED WITH A GREATER THAN STOICHIOMETRIC AMOUNT OF 1- CYCLOHEXYLAMINO-3AMINOPROPANE TO FORM A MOLDING COMPOSITION. AN AMOUNT BETWEEN 1.1 AND 1.5 TIMES THE STOICHIOMETRIC AMOUNT IS USED. MOLDS FILLED WITH THE COMPOSITION ARE TREATED AT A TEMPERATURE OF AT LEAST ABOUT 70*C. TO PRODUCE CURED, HARDENED MOLDED COMPONENTS.
Inventors
- 👤 G Hampel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:05
CPC Classifications
B; B29; B29D; B29D12/00; B29D12/02; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3212; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5026
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |