US3281308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated chimney
Assignee: United States Steel Corp
•
Filing: 1961-09-28
•
Granted: 1966-10-25
•
Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Asto Eugene G D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
F; F23; F23J; F23J13/00; F23J13/02; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969; Y10T428/25; Y10T428/251; Y10T428/31504; Y10T428/31652
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
IN THE COMBINATION OF A CHIMNEY HAVING A WALL HAVING AN INNER SURFACE AND A COATING FOR THE INNER SURFACE OF THE CHIMNEY THE IMPROVEMENT COMPRISING EMPLOYING AS SAID COATING A CORROSIVE GAS RESISTANT COMPOSITION WHICH IS A NON-SHRINKABLE MASTIC COMPRISING 50-55% UNBLOWN ASPHALT, 10-12% CHLORINATED RESINOUS PARAFFIN, 0.5-1.5% FINELY DIVIDED SILICA, 3-5% ANTIMONY OXIDE, 5-6% EXPANDED PERLITE, 15-20% ASBESTOS, 7-8% POLYBUTENE OIL AND 3-4% MICA, THE TOTAL ADDING UP TO 10%.
Claim 2
Dependent Claim
72 words
IN THE COMBINATION OF A CHIMNEY HAVING A WALL HAVING AN INNER SURFACE AND A COATING FOR THE INNER SURFACE OF THE CHIMNEY THE IMPROVEMENT COMPRISING EMPLOYING AS SAID COATING A CORROSIVE GAS RESISTANT COMPOSITION WHICH IS A NON-SHRINKABLE MASTIC COMPRISING 50-55% UNBLOWN ASPHALT, 10-12% CHLORINATED RESINOUS PARAFFIN, 0.5-1.5% FINELY DIVIDED SILICA, 3-5% ANTIMONY OXIDE, 5-6% EXPANDED PERLITE, 15-20% ASBESTOS, 7-8% POLYBUTENE OIL AND 3-4% MICA, THE TOTAL ADDING UP TO 10%.
Claim 3
Dependent Claim
16 words
A COMBINATION ACCORDING TO CLAIM 1 WHEREIN THE MASTIC IS COVERED BY A LAYER OF FIIREBRICK.
References Cited (Backward Citations)
US1347980A
Cited
US2327752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |