Patent US2654514A successfully refreshed from Google Patents.
Patent US2805961A successfully refreshed from Google Patents.
US2805961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-repellent aerogels
Assignee: National Research Council Canada
•
Filing: 1952-03-05
•
Granted: 1957-09-10
•
Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 Ira E Puddington
- 👤 Aurelio F Siriani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:33
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCES FOR MAKING A POLYESTER RESIN COATED INORGANIC AEROGEL COMPRISING REPLACING THE WATER IN A PRECIPITATED INORGANIC GEL WITH A WATER MISCIBLE ORGANIC SOLVENT HAVING A CRITICAL TEMPERATURE LESS THAN WATER, DISSOLVING IN THE MIXTURE SO FORMED THE REACTION PRODUCT OF A POLYCARBOXYLIC ACID AND POLYHYDRIC ALCOHOL, HEATING SAID MASS UNDER PRESSURE TO A TEMPERATURE IN EXCESS OF THE CRITICAL TEMPERATURE OF THE ORGANIC SOLVENT, ALLOWING THE GASIFIED ORGANIC SOLVENT TO ESCAPE THUS PRODUCING AN INORGANIC AEROGEL HAVING THE SURFACE THEREOF COATED WITH A CONTINUOUS FILM OF RESIN.
Claim 2
Dependent Claim
89 words
A PROCES FOR MAKING A POLYESTER RESIN COATED INORGANIC AEROGEL COMPRISING REPLACING THE WATER IN A PRECIPITATED INORGANIC GEL WITH A WATER MISCIBLE ORGANIC SOLVENT HAVING A CRITICAL TEMPERATURE LESS THAN WATER, DISSOLVING IN THE MIXTURE SO FORMED THE REACTION PRODUCT OF A POLYCARBOXYLIC ACID AND POLYHYDRIC ALCOHOL, HEATING SAID MASS UNDER PRESSURE TO A TEMPERATURE IN EXCESS OF THE CRITICAL TEMPERATURE OF THE ORGANIC SOLVENT, ALLOWING THE GASIFIED ORGANIC SOLVENT TO ESCAPE THUS PRODUCING AN INORGANIC AEROGEL HAVING THE SURFACE THEREOF COATED WITH A CONTINUOUS FILM OF RESIN.
References Cited (Backward Citations)
US2306222A
Cited
US2412470A
Cited
US2589705A
Cited
US2444752A
Cited
US2567315A
Cited
US2479836A
Cited
US2625512A
Cited
US2474704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |