Patent US3928693A successfully refreshed from Google Patents.
US3928693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite article of fibers and resins
Assignee: Individual
•
Filing: 1973-09-19
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Granted: 1975-12-23
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Expires: 1993-09-19
Abstract
Abstract A composite article has a body constituted by one or more fiber layers which are permeated by two resins of different melting and curing points in nonoverlapping ranges, one resin forming a coating around the body on account of having been melted under pressure at a temperature above the curing point of the other resin.
Inventors
- 👤 Bernard Rudloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:02
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/003; B29K; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/239; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/31504; Y10T428/31844; Y10T428/31848; Y10T428/31942; Y10T428/31949
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A COMPOSITE ARTICLE COMPRISING AT LEAST ONE LAYER OF FIBERS PERMEATED BY A MIXTURE OF A ROSIN WITH A CURING TEMPERATURE IN A RANGE OF ABOUT 60* TO 100*C AND A PHENOL-FORMALDEHYDE POLYMER WHOSE MELTING POINT UNDER A PRESSURE OF ABOUT 400 TO 600 KG/CM2 IS IN A RANGE OF ABOUT 110* TO200*C, SAID LAYER BEING ENCASED IN SAI POLYMER.
Claim 2
Dependent Claim
60 words
A COMPOSITE ARTICLE COMPRISING AT LEAST ONE LAYER OF FIBERS PERMEATED BY A MIXTURE OF A ROSIN WITH A CURING TEMPERATURE IN A RANGE OF ABOUT 60* TO 100*C AND A PHENOL-FORMALDEHYDE POLYMER WHOSE MELTING POINT UNDER A PRESSURE OF ABOUT 400 TO 600 KG/CM2 IS IN A RANGE OF ABOUT 110* TO200*C, SAID LAYER BEING ENCASED IN SAI POLYMER.
References Cited (Backward Citations)
US1998827A
Cited
US3200181A
Cited
US3121656A
Cited
US3393117A
Cited
US3542633A
Cited
US3671372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |