Patent US3417633A successfully refreshed from Google Patents.
US3417633A
Expired / Lapsed
US
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Drafting apron having improved frictional qualities
Assignee: Armstrong World Industries Inc
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Filing: 1964-11-27
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Granted: 1968-12-24
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Expires: 1984-11-27
Abstract
No abstract record available.
Inventors
- 👤 James E Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:07
CPC Classifications
D; D01; D01H; D01H5/00; D01H5/18; D01H5/70; D01H5/86; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A TEXTILE FIBER DRAFTING APRON HAVING INNER AND OUTER LAYERS OF SYNTHETIC RUBBER, SAID INNER LAYER HAVING DISPERSED THROUGHOUT THE BODY THEREOF, AN ADDITIVE COMPRISING ALKALI METAL SALTS SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC SULFATES, ALIPHATIC SULFONATES AND MIXTURES THEREOF, SAID SALTS CONTAINING 10-16 CARBON ATOMS, SAID ADDITIVE BEING CAPATIBLE WITH SAID INNER LAYER RUBBER AND PRESENT THEREIN IN THE RANGE OF FROM 1 TO 6 PARTS BY WEIGHT OF THE ADDITIVE TO 100 PARTS BY WEIGHT OF THE RUBBER, SAID ADDITIVE IMPARTING A SURFACE CHARACTERISTIC THERETO WHICH DOES NOT IMPAIR ITS FRICTIONAL QUALITIES,, ALLOWING IT
Claim 2
Dependent Claim
97 words
A TEXTILE FIBER DRAFTING APRON HAVING INNER AND OUTER LAYERS OF SYNTHETIC RUBBER, SAID INNER LAYER HAVING DISPERSED THROUGHOUT THE BODY THEREOF, AN ADDITIVE COMPRISING ALKALI METAL SALTS SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC SULFATES, ALIPHATIC SULFONATES AND MIXTURES THEREOF, SAID SALTS CONTAINING 10-16 CARBON ATOMS, SAID ADDITIVE BEING CAPATIBLE WITH SAID INNER LAYER RUBBER AND PRESENT THEREIN IN THE RANGE OF FROM 1 TO 6 PARTS BY WEIGHT OF THE ADDITIVE TO 100 PARTS BY WEIGHT OF THE RUBBER, SAID ADDITIVE IMPARTING A SURFACE CHARACTERISTIC THERETO WHICH DOES NOT IMPAIR ITS FRICTIONAL QUALITIES,, ALLOWING IT
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |