Patent US3869191A successfully refreshed from Google Patents.
Patent US3072968A successfully refreshed from Google Patents.
US3072968A
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Heat treatment of rubber
Assignee: Rubber and Plastics Research Association of Great Britain
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Filing: 1960-10-31
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Granted: 1963-01-15
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Expires: 1980-10-31
Abstract
No abstract record available.
Inventors
- 👤 Watson William Ferguson
- 👤 Izod Donald Alfred William
- 👤 Hughes Brian Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:35
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/0244; B29C35/025; B29C48/00; B29C48/03; B29C48/09; B29K; B29K2021/00; Y; Y10; Y10S; Y10S264/00; Y10S264/51; Y10S425/00; Y10S425/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD OF VULCANIZING RUBBER MIXTURES WHICH COMPRISES: ESTABLISHING A BED OF PARTICLES OF FINELY DIVIDED SOLID MATERIAL; MAINTAINING THE PARTICLES OF SAID MATERIAL IN FLUID SUSPENSION BY PASSING A GAS UPWARDLY THROUGH SAID BED; CONTROLLING THE PRESSURE OF SAID BED BY REGULATING THE HEIGHT OF SAID BED AND THE PRESSURE OF THE FLUIDIZING GAS ADMITTED THERETO; HEATING THE PARTICLES IN SAID BED AND MAINTAINING THEM AT ANN ELEVATED TEMPERATURE;
Claim 2
Independent Claim
70 words
A METHOD OF VULCANIZING RUBBER MIXTURES WHICH COMPRISES: ESTABLISHING A BED OF PARTICLES OF FINELY DIVIDED SOLID MATERIAL; MAINTAINING THE PARTICLES OF SAID MATERIAL IN FLUID SUSPENSION BY PASSING A GAS UPWARDLY THROUGH SAID BED; CONTROLLING THE PRESSURE OF SAID BED BY REGULATING THE HEIGHT OF SAID BED AND THE PRESSURE OF THE FLUIDIZING GAS ADMITTED THERETO; HEATING THE PARTICLES IN SAID BED AND MAINTAINING THEM AT ANN ELEVATED TEMPERATURE;
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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |