US2870108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel silica products and silicone rubber containing same coated silica aerogel, silicone rubber reinforced therewith and method of making
Assignee: Monsanto Chemicals Ltd
•
Filing: 1954-05-06
•
Granted: 1959-01-20
•
Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Nickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:56
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/025; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS OF PRODUCING IMPROVED SILICA AEROGELS WHICH COMPRISES COMMINUTING IN AN AIR ATTRITION MILL HYDROPHILIC SILICA AEROGEL PARTICLES HAVING AN ACID NUM BER BETWEEN 0.3 AND 3. A SURFACE AREA BETWEEN 100 AND 600 SQUARE METERS PER GRAM, A BULK DENSITY OF 2 TO 8 POUNDS PER CUBIC FOOT AND AN ULTIMATE PARTICLE SIZE BETWEEN ABOUT 5 AND 40 MILLIMICRONS AND CONCURRENTLY SPRAYING SAID PARTICLES WITH DROPLETS CONTAINING TETRA ETHYL ORTHOSILICATE, SAID SILICATE BEING APPLIED IN AMOUNTS OF ABOUT 3 TO 20% BY WEIGHT, BASED ON THE DRY SILICA AEROGEL PARTICLES, WHEREBY SILICA AEROGELS ARE OBTAINED WHICH ARE HYDROPHILIC TO PARTIALLY HYDROPHOBIC BUT NON ORGANOPHILIC, SAID COMMINUTING STEP BEING CARRIED OUT IN AN ATMOSPHERE OF AIR AT A TEMPERATURE BETWEEN ABOUT 110 AND 200* C. UNTIL SAID AEROGEL PARTICLES HAVE AN AGGREGATE PARTICLE SIZE BETWEEN 0.01 AND 15 MICRONS.
Claim 2
Dependent Claim
140 words
A PROCESS OF PRODUCING IMPROVED SILICA AEROGELS WHICH COMPRISES COMMINUTING IN AN AIR ATTRITION MILL HYDROPHILIC SILICA AEROGEL PARTICLES HAVING AN ACID NUM BER BETWEEN 0.3 AND 3. A SURFACE AREA BETWEEN 100 AND 600 SQUARE METERS PER GRAM, A BULK DENSITY OF 2 TO 8 POUNDS PER CUBIC FOOT AND AN ULTIMATE PARTICLE SIZE BETWEEN ABOUT 5 AND 40 MILLIMICRONS AND CONCURRENTLY SPRAYING SAID PARTICLES WITH DROPLETS CONTAINING TETRA ETHYL ORTHOSILICATE, SAID SILICATE BEING APPLIED IN AMOUNTS OF ABOUT 3 TO 20% BY WEIGHT, BASED ON THE DRY SILICA AEROGEL PARTICLES, WHEREBY SILICA AEROGELS ARE OBTAINED WHICH ARE HYDROPHILIC TO PARTIALLY HYDROPHOBIC BUT NON ORGANOPHILIC, SAID COMMINUTING STEP BEING CARRIED OUT IN AN ATMOSPHERE OF AIR AT A TEMPERATURE BETWEEN ABOUT 110 AND 200* C. UNTIL SAID AEROGEL PARTICLES HAVE AN AGGREGATE PARTICLE SIZE BETWEEN 0.01 AND 15 MICRONS.
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |