Patent US3350334A successfully refreshed from Google Patents.
US3350334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Castor oil-hexachloroendomethylenetetrahydrophthalic anhydride reaction product
Assignee: North American Aviation Corp
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Filing: 1962-12-31
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Granted: 1967-10-31
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Russell A Skiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:17
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR ACHIEVING A POLYMER HAVING RUBBERLIKE CONSISTENCY, A LOW DIELECTRIC CONSTANT AND A LOW DISSIPATION FOACTOR, COMPRISING THE STEPS OF; HEATING , TO AN ELEVATED TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF THE REACTANTS, A POLYFUNCTIONAL HYDROXYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF A POLYOXY-1,2-PROPYLENE EITHER TRIOL INITIATED WITH GLYCERINE AND HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE FROM 2500 TO 3950, AND CASTOR OIL, REACTING WITH SAID HEATED POLYFUNCTIONAL HYDROXYL COMPOUND A STOICHIOMETRIC AMOUNT OF HALOGENATED ORGANIC ACID ANHYDRIDE, DETERMINING COMPLETION OF THE REACTION BETWEEN SAID POLYFUNCTIONAL HYDROXYL COMPOUND AND SAID HALOGENATED ORGANIC ACID ANHYDRIDE, MIXING SAID REACTION PRODUCTS WITH AN UNCURED BISPHENOL EPICHLOROHYDRIN EPOXY RESIN, AND CURING SAID MIXTURE.
Claim 2
Dependent Claim
114 words
A PROCESS FOR ACHIEVING A POLYMER HAVING RUBBERLIKE CONSISTENCY, A LOW DIELECTRIC CONSTANT AND A LOW DISSIPATION FOACTOR, COMPRISING THE STEPS OF; HEATING , TO AN ELEVATED TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF THE REACTANTS, A POLYFUNCTIONAL HYDROXYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF A POLYOXY-1,2-PROPYLENE EITHER TRIOL INITIATED WITH GLYCERINE AND HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE FROM 2500 TO 3950, AND CASTOR OIL, REACTING WITH SAID HEATED POLYFUNCTIONAL HYDROXYL COMPOUND A STOICHIOMETRIC AMOUNT OF HALOGENATED ORGANIC ACID ANHYDRIDE, DETERMINING COMPLETION OF THE REACTION BETWEEN SAID POLYFUNCTIONAL HYDROXYL COMPOUND AND SAID HALOGENATED ORGANIC ACID ANHYDRIDE, MIXING SAID REACTION PRODUCTS WITH AN UNCURED BISPHENOL EPICHLOROHYDRIN EPOXY RESIN, AND CURING SAID MIXTURE.
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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) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |