US3069386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic aromatic polyformal resins and process for preparing same
Assignee: Union Carbide Corp
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Filing: 1959-02-04
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Granted: 1962-12-18
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Expires: 1979-02-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Barclay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4006; C08G64/00; C08G64/18; C08G64/183; C08G75/00; C08G75/20; C08G75/23; C08G2650/00; C08G2650/28; C08G2650/38; C08G2650/44; C08G2650/46; C08G2650/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PROCESS FOR PREPARING SUBSTANTIALLY LINEAR AROMATIC THERMOPLASTIC POLYFORMALS WHICH COMPRISES CONDENSING POLYMERIZING PROPORTIONS OF A METHYLEN HALIDE WITH THE DOUBLE ALKALI METAL SALT OF A DIHYDRIC PHENOL IN AN INERT POLAR SOLVENT.
Claim 2
Dependent Claim
33 words
A PROCESS FOR PREPARING SUBSTANTIALLY LINEAR AROMATIC THERMOPLASTIC POLYFORMALS WHICH COMPRISES CONDENSING POLYMERIZING PROPORTIONS OF A METHYLEN HALIDE WITH THE DOUBLE ALKALI METAL SALT OF A DIHYDRIC PHENOL IN AN INERT POLAR SOLVENT.
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) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |