US3560328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde impregnated cellulosic sheets and laminates
Assignee: Monsanto Co
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Filing: 1968-07-25
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Granted: 1971-02-02
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Expires: 1988-07-25
Abstract
Abstract IMPREGNATED CELLULOSIC SHEETS AND LAMINATES WHICH ARE COLD PUNCHABLE AND HAVE GOOD ELECTRICAL PROPERTIES. SUCH CONSTRUCTIONS ARE PREPARED FROM CELLULOSIC SUBSTRATES IMPREGNATED WITH A MIXTURE OF CARBOXYLATED ALKADIENE INTERPOLYMER AND A LOW MOLECULAR WEIGHT PHENOL-FORMALDEHYDE RESIN AND THEN OVERTREATED WITH A CERTAIN HIGHER MOLECULAR WEIGHT SUBSTITUTED PHENO-FORMALDEHYDE RESIN. LAMINATES ARE MADE FROM THE RESULING SHEET-LIKE MEMBERS BY FIRST ADVANCING SAME AND THEN LAYING UP AND THERMOSETTING UNDER HEAT AND PRESSSURE.
Inventors
- 👤 George J Anderson
- 👤 Ronald H Dahms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:05
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; D21H17/34; D21H17/35; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31877; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2762; Y10T442/277; Y10T442/2828; Y10T442/2836; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3569; Y10T442/3577; Y10T442/60; Y10T442/659
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |