US2744875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular phenolic resin materials
Assignee: Lockheed Martin Corp
•
Filing: 1951-06-14
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Granted: 1956-05-08
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Expires: 1971-06-14
Abstract
No abstract record available.
Inventors
- 👤 Frank W Thomas
- 👤 Simon Eli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
THE METHOD OF MAKING A CELLULAR PLASTIC MATERIAL WHICH COMPRISES THE INCORPORATION IN AN ACID CATALYZABLE, WATER MISCIBLE PHENOL-ALDEHYDE RESOL HAVING A SPECIFIC GRAVITY OF BETWEEN 1.15 AND 1.35 AND A PH OF ABOUT 7 OF FROM ABOUT 0.01% TO ABOUT 20% OF THE TOTAL WEIGHT OF THE OTHER INGREDIENTS OF A GASSING AGENT SELECTED FROM THE CLASS CONSISTING OF: ALUMINUM LEAFING POWDER, MAGNESIUM LEAFING POWDER, IRON LEAFING POWDER, ZINC LEAFING POWDER, AND THEN MIXING WITH SAID RESOL-GASSING AGENT MIXTURE A CATALYST IN THE AMOUNT OF FROM ABOUT 0.5% TO 20% OF THE WEIGHT OF THE RESOL, THE CATALYST BEING AN AQUEOUS ACIDIC BLEND OF BENZENE SULFONIC ACID AND ORTHOPHOSPHORIC ACID WHICH CONSUME AND GASSIFIES THE GASSING AGENT TO FORM THE CELLULAR MATERIAL.
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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) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |