US2835330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blocking the ways of damps in mines
Assignee: Individual
•
Filing: 1954-08-20
•
Granted: 1958-05-20
•
Expires: 1974-08-20
Abstract
No abstract record available.
Inventors
- 👤 Bauer Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:45
CPC Classifications
E; E21; E21F; E21F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
METHOD OF BLOCKING THE FIRE DAMP IN MINES, COMPRISING ADDING PHOSPHORIC ACID AS A CATALYST TO THE SOLUTION OF A FOAM-FORMING MATERIAL, SIMULTANEOUSLY SPRAYING THE SOLUTION OBTAINED AND A SOLUTION OF A PRELIMINARY CONDENSATE OF A UREA-FORMALDEHYDE RESIN INTO SPACES WHERE THE BLOCKING IS INTENDED, AND ALLOWING THE FOAM FORMED TO BECOME FIRM BY THE SOLIDIFYING ACTION OF SAID CONDENSATE AND THUS TO FORM FIRM DAMP-BLOCKING MEANS MAINTAINING ITS VOLUME AND FOAMY STRUCTURE.
Claim 2
Dependent Claim
73 words
METHOD OF BLOCKING THE FIRE DAMP IN MINES, COMPRISING ADDING PHOSPHORIC ACID AS A CATALYST TO THE SOLUTION OF A FOAM-FORMING MATERIAL, SIMULTANEOUSLY SPRAYING THE SOLUTION OBTAINED AND A SOLUTION OF A PRELIMINARY CONDENSATE OF A UREA-FORMALDEHYDE RESIN INTO SPACES WHERE THE BLOCKING IS INTENDED, AND ALLOWING THE FOAM FORMED TO BECOME FIRM BY THE SOLIDIFYING ACTION OF SAID CONDENSATE AND THUS TO FORM FIRM DAMP-BLOCKING MEANS MAINTAINING ITS VOLUME AND FOAMY STRUCTURE.
References Cited (Backward Citations)
US2551919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |