US2721146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bituminous covering material and method of making
Assignee: Standard Oil Co
•
Filing: 1952-08-15
•
Granted: 1955-10-18
•
Expires: 1972-08-15
Abstract
No abstract record available.
Inventors
- 👤 Harley F Hardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:50
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/61; D06; D06N; D06N5/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31815; Y10T428/31819; Y10T428/31823
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A BITUMINOUS COVERING COMPRISING AN ABSORBENT SHEET MATERIAL SATURATED WITH A FIRST ASPHALT, SAID ASPHALT SATURATED SHEET BEING COATED WITH A SECOND ASPHALT HARDER THAN SAID FIRST ASPHALT, THE PETROLENE VISCOSITY OF THE SATURANT AT 77* F. BEING NOT MORE THAN ABOUT 500 POISES MORE THAN THE PETROLENE VISCOSITY OF THE COATING AT 77* F.
Claim 2
Dependent Claim
55 words
A BITUMINOUS COVERING COMPRISING AN ABSORBENT SHEET MATERIAL SATURATED WITH A FIRST ASPHALT, SAID ASPHALT SATURATED SHEET BEING COATED WITH A SECOND ASPHALT HARDER THAN SAID FIRST ASPHALT, THE PETROLENE VISCOSITY OF THE SATURANT AT 77* F. BEING NOT MORE THAN ABOUT 500 POISES MORE THAN THE PETROLENE VISCOSITY OF THE COATING AT 77* F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |