US3340693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for inducing hardening or cementing in a mass of back-fill in a mine opening
Assignee: Individual
•
Filing: 1965-04-01
•
Granted: 1967-09-12
•
Expires: 1985-04-01
Abstract
No abstract record available.
Inventors
- 👤 William S Row
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
E; E21; E21F; E21F15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A METHOD OF FORMING A SUBSTANTIALLY RIGID MASS IN A MINE OPENING WHICH COMPRISES: (A) CHARGING SAID OPENING WITH A FILL MATERIAL SUCH AS ROCK OR GRAVEL AND WHICH CONTAINS A REACTIVE SUBSTANCE; AND (B) PASSING A REACTIVE FLUID UPWARDLY THROUGH SAID MATERIAL WHICH IS CAPABLE OF REACTING WITH THE SUBSTANCE
Claim 2
Independent Claim
51 words
A METHOD OF FORMING A SUBSTANTIALLY RIGID MASS IN A MINE OPENING WHICH COMPRISES: (A) CHARGING SAID OPENING WITH A FILL MATERIAL SUCH AS ROCK OR GRAVEL AND WHICH CONTAINS A REACTIVE SUBSTANCE; AND (B) PASSING A REACTIVE FLUID UPWARDLY THROUGH SAID MATERIAL WHICH IS CAPABLE OF REACTING WITH THE SUBSTANCE
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |