Patent US3753938A successfully refreshed from Google Patents.
US3753938A
Expired / Lapsed
US
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Thermoplastic sheet material
Assignee: TBP INDUSTIES Ltd
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Filing: 1972-04-18
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Granted: 1973-08-21
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Expires: 1992-04-18
Abstract
Abstract A FLEXIBLE WATERPROOF SHEET MATERIAL IS MADE BY FORMING A UNIFORM MIXTURE OF CALENDERABLE CONSISTENCY CONTAINING HARD BITUMEN OF SOFTENING POINT AT LEAST 70*C., A COMPATIBLE SYNTHETIC ELASTOMER WHICH CONSTITUTES A MAXIMUM OF 50% BY WEIGHT OF THE MIXTURE, AND NON-FIBROUS AND FIBROUS REINFORCING FILLER, AND CALENDERING THE MIXTURE TO FORM A SHEET OF UNIFORM COMPOSITION.
Inventors
- 👤 Edwards R Montague
- 👤 P Tierney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:45
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/26; C08L23/28; C08L23/286; C08L23/32; C08L23/34; C08L95/00; C08L2201/00; C08L2201/02; C08L2205/00; C08L2205/03; C08L2205/035; C08L2205/14; C08L2205/16; C08L23/08; C08L23/0846; C08L23/0853; C08L57/00; C08L57/06; C08L57/08; C08L67/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/31504; Y10T428/31652; Y10T428/3167; Y10T428/31678; Y10T428/31692; Y10T428/31696; Y10T428/31699; Y10T428/31707; Y10T428/31717; Y10T428/31815; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159; Y10T442/60; Y10T442/654; Y10T442/656
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |