US3362837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dense heat insulating and nonabsorbent concrete
Assignee: National Pumicite Development Corp
•
Filing: 1965-12-28
•
Granted: 1968-01-09
•
Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 Walker James Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:01
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/14; C04B14/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A DENSE HEAT INSULATING AND NONABSORBENT CONCRETE COMPRISING THE HARDENED PRODUCT OBTAINED WHEN A CONVENTIONAL DENSE CONCRETE MIX COMPRISING WATER, CEMENT, COARSE AGGREGATE AND SAND IS MIXED WITH EXPANDED PUMICITE IN AN AMOUNT AND OF A PARTICLE SIZE SUFFICIENT TO FILL A MAJORITY OF THE VOIDS BETWEEN THE DENSE AGGREGATE PARTICLES AND ALLOWED TO SET, SAID EXPANDED PUMICITE BEING SUBSTANTIALY ALL HOLLOW DISCRETE GLASSY SURFACED SPHERICAL PARTICLES OF A SIZE OF THE ORDER OF 200 MESH AND SMALLER.
References Cited (Backward Citations)
US2315732A
Cited
GB395426A
Cited
US2501699A
Cited
US2501698A
Cited
US2634207A
Cited
US2565107A
Cited
US2858227A
Cited
US2880101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |