US3718131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum collar for roofing kettles and the like
Assignee: Individual
•
Filing: 1972-02-07
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Granted: 1973-02-27
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Expires: 1992-02-07
Abstract
Abstract ROOFING KETTLES OR THE LIKE, FOR HEATING MASSES OF BITUMINOUS MATERIAL, PROVIDED WITH MEANS FOR REDUCING THE SMOKE, FUMES AND VAPORS GIVEN OFF IN OPERATION ARE DISCLOSED, WHICH MEANS COMPRISE VARIOUS EMBODIMENTS OF THE INVENTION. EMBODIMENTS OF THE INVENTION SUITABLE FOR RETROFITTING EXISTING KETTLES, AS WELL AS THE EMBODIMENT OF THE INVENTION IN KETTLES AS ORGINALLY BULT IN VARIOUS FORMS ARE DESCRIBED.
Inventors
- 👤 E Busse
- 👤 G Raker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:13
CPC Classifications
E; E04; E04D; E04D15/00; E04D15/07; C; C10; C10C; C10C3/00; C10C3/10; C10C3/12; F; F23; F23D; F23D17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |