US2699409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic lightweight aggregate
Assignee: Research Counsel Inc
•
Filing: 1950-09-26
•
Granted: 1955-01-11
•
Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Hashimoto Tadaichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:37
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/02; C04B18/027; Y; Y10; Y10S; Y10S106/00; Y10S106/02; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
SYNTHETIC SMOOTH-SURFACED PELLETS FOR USE AS LIGHTWEIGHT AGGREGATE, COMPOSED OF FINES FROM THE POPPING OF PERLITE BONDED TOGETHER BY CLAY, THE PELLETS BEING POROUS WITH A SUBSTANTIALLY WATER-IMPERMEABLE SKIN AT THE SURFACE PRODUCED BY FIRING THE AFORESAID COMPOSITION, THE DENSITY OF THE PELLETS BEING NOT SUBSTANTIALLY GREATER THAN TWENTY FIVE POUNDS PER CUBIC FOOT.
Claim 2
Dependent Claim
54 words
SYNTHETIC SMOOTH-SURFACED PELLETS FOR USE AS LIGHTWEIGHT AGGREGATE, COMPOSED OF FINES FROM THE POPPING OF PERLITE BONDED TOGETHER BY CLAY, THE PELLETS BEING POROUS WITH A SUBSTANTIALLY WATER-IMPERMEABLE SKIN AT THE SURFACE PRODUCED BY FIRING THE AFORESAID COMPOSITION, THE DENSITY OF THE PELLETS BEING NOT SUBSTANTIALLY GREATER THAN TWENTY FIVE POUNDS PER CUBIC FOOT.
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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) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |