US2728741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde resins for foaming compositions
Assignee: Lockheed Martin Corp
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Filing: 1952-11-01
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Granted: 1955-12-27
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Simon Eli
- 👤 Frank W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08G; C08G8/00; C08G8/04; C08J2361/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE CONDENSATION PRODUCT OF 1 MOL OF A PHENOL, FROM 1 TO 2.5 MOLS FORMALDEHYDE, FROM 2.0X10-4 MOLS TO 1.0X10-4 MOLS BARIUM HYDROXIDE OCTAHYDRATE AND FROM 1X10-2 TO 2X10-2 MOLS SODIUM HYDROXIDE, THE HYDROXIDES CONSTITUTING A CATALYST.
Claim 2
Dependent Claim
37 words
THE CONDENSATION PRODUCT OF 1 MOL OF A PHENOL, FROM 1 TO 2.5 MOLS FORMALDEHYDE, FROM 2.0X10-4 MOLS TO 1.0X10-4 MOLS BARIUM HYDROXIDE OCTAHYDRATE AND FROM 1X10-2 TO 2X10-2 MOLS SODIUM HYDROXIDE, THE HYDROXIDES CONSTITUTING A CATALYST.
References Cited (Backward Citations)
US2629698A
Cited
US2608536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |