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Patent US3581522A successfully refreshed from Google Patents.
US3581522A
Expired / Lapsed
US
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Polyblend gems and the like and methods for producing them
Assignee: Honeywell International Inc
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Filing: 1968-05-01
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Granted: 1971-06-01
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Expires: 1988-05-01
Abstract
Abstract Artificial gems are produced from matrix-type filaments comprised of a polyamide matrix-forming polymer having micronsized polyester fibrils dispersed in said matrix. The polymers have different indexes of refraction so that a cat''s eye or chatoyancy effect is displayed when these filaments are fused together, shaped and polished.
Inventors
- 👤 Robert C Wincklhofer
- 👤 Gene C Weedon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:34
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/347; B29C67/00; B29C67/02; B29C67/04; B29C70/06; B29C70/10; B29C70/12; B29C70/14; B44; B44C; B44C5/00; B44C5/06; B44F; B44F9/00; B44F9/04; B29C2793/00; B29C2793/009; B29K; B29K2077/00; B29K2105/00; B29K2105/25; B29K2267/00; B29K2995/00; B29K2995/0018; B29K2995/0026; B29K2995/0031; B29L; B29L2031/00; B29L2031/743; B29L2031/7432
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
The article of claim 1 in the shape of a cabachon with the surface polished and the fibrils generally parallel to the cabachon''s base so that rays of light are displayed.
Claim 2
Dependent Claim
21 words
The article of claim 1 in the shape of an asteriated gem displaying a star having an odd number of points.
Claim 3
Dependent Claim
18 words
The article of claim 1 in which the matrix polymer is polycaproamide and the fibrils are polyethylene terephthalate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |