US3698972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing and insulating a roof construction
Assignee: Individual
•
Filing: 1968-08-14
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Granted: 1972-10-17
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Expires: 1988-08-14
Abstract
Abstract THE METHOD INCLUDING SPRAYING A CELLULAR PLASTIC FILM ONTO THE ROOF STRUCTURE, ALLOWING THE CELLULAR PLASTIC TO EXPAND TO THE DESIRED THICKNESS, AND SHAVING THE EXPANDED PLASTIC TO PROVIDE A SMOOTH SURFACE SUITABLE FOR THE APPLICATION OF A BUILT-UP ROOF OR OTHER PROTECTIVE COATINGS. TAR, TAR PAPER AND ADDITIONAL TAR OR OTHER PROTECTIVE COATINGS ARE THEN APPLIED TO THE SMOOTH EXPANDED PLASTIC. THE EXPANDED PLASTIC IS SHAVED BY A MACHINE HAVING A ROTATABLE DRUM AND INCLUDES ADJUSTMENT MEANS FOR VARYING THE THICKNESS OF THE CUT.
Inventors
- 👤 James Lenzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
E; E04; E04D; E04D11/00; E04D11/02; E04D15/00; E04D15/07; E04D7/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/108; Y10T156/1089; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/2443; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/31504; Y10T428/31815; Y10T428/31819; Y10T428/31823
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |