US3751308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible exothermic mat and method of use
Assignee: EXOMET
•
Filing: 1971-07-19
•
Granted: 1973-08-07
•
Expires: 1991-07-19
Abstract
Abstract An exothermic charge is secured to a flexible backing material forming an elongated mat. Grooves in the mat extending from the surface of the charge to the backing material allow the mat to be placed over a regular shape such as a pipe to provide a covering blanket of exothermic charge. The flexible mat is particularly useful in combination with insulation and other accessories for exothermically annealing welded pipe and the like in the field.
Inventors
- 👤 H Bishop
- 👤 J Deck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:56
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/50; F; F24; F24V; F24V30/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
43 words
A method according to claim 1 wherein auxiliary low-temperature insulation is placed around the exposed pipe for a predetermined distance on either side of the formable exothermic and is affixed to said joint in contact with the exposed edges of said formable exothermic.
Claim 2
Dependent Claim
77 words
A method according to claim 1 wherein additional formable exothermic is shaped into relatively thin rings for treating welds at other than straight line joints, such as pipe to elbow, pipe to tee, and the like and said rings are placed at a location away from the primary exothermic material with at least one point of each ring contacting its neighboring ring and the ring adjacent the primary exothermic material making at least a point contact therewith.
Claim 3
Dependent Claim
21 words
A method according to claim 3 wherein insulation is placed in the spaces between the exothermic rings and the exothermic material.
Claim 4
Dependent Claim
22 words
A method according to claim 4 wherein the entire ring and primary exothermic material assembly is covered with a layer of insulation.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |