US3015855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for making hollow bodies
Assignee: Individual
•
Filing: 1958-05-01
•
Granted: 1962-01-09
•
Expires: 1978-05-01
Abstract
No abstract record available.
Inventors
- 👤 Merkel Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:16
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/04; B29K2105/25; B29K2105/251; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/712; B29L2031/7136; Y; Y10; Y10S; Y10S425/00; Y10S425/019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF MAKING A HALLOW POROUS BODY OF GRANULAR AND PULVEROUS HEAT EXPANDABLE MATERIAL COMPOSED AT LEAST PARTLY OF SINTERED POLYTETRAFLUOROETHYLENE, WHICH COMPRISES THE STEPS OF: CONFINING THE MATERIAL TO BE FORMED INTO SAID HOLLOW BODY BETWEEN A RIGID WALL OF ANNULAR CROSS SECTION AND AN ELASTIC WALL OF ANNULAR CROSS SECTION, SUBJECTING SAID ELASTIC WALL TO CONTROLLED FLUID PRESSURE SO AS TO CAUSE SAID ELASTIC WALL TO EXPAND, AND COMPRESSING THE MATERIAL BETWEEN THE LATTER AND SAID RIGID WALL, SUBSEQUENTLY CONFINING THE COMPRESSED BODY IN A CORRESPONDINGLY SHAPED CHAMBER OF SUFFICIENTLY GREATER VOLUME THAN THE VOLUME OF SAID COMPRESSED BODY TO PERMIT LIMITED EXPANSION THEREOF, AND SINTERING THE COMPRESSED BODY IN SAID CHAMBER TO EXPAND SAID BODY TO A PREDETERMINED DEGREE OF POROSITY.
Claim 2
Independent Claim
125 words
A METHOD OF MAKING A HALLOW POROUS BODY OF GRANULAR AND PULVEROUS HEAT EXPANDABLE MATERIAL COMPOSED AT LEAST PARTLY OF SINTERED POLYTETRAFLUOROETHYLENE, WHICH COMPRISES THE STEPS OF: CONFINING THE MATERIAL TO BE FORMED INTO SAID HOLLOW BODY BETWEEN A RIGID WALL OF ANNULAR CROSS SECTION AND AN ELASTIC WALL OF ANNULAR CROSS SECTION, SUBJECTING SAID ELASTIC WALL TO CONTROLLED FLUID PRESSURE SO AS TO CAUSE SAID ELASTIC WALL TO EXPAND, AND COMPRESSING THE MATERIAL BETWEEN THE LATTER AND SAID RIGID WALL, SUBSEQUENTLY CONFINING THE COMPRESSED BODY IN A CORRESPONDINGLY SHAPED CHAMBER OF SUFFICIENTLY GREATER VOLUME THAN THE VOLUME OF SAID COMPRESSED BODY TO PERMIT LIMITED EXPANSION THEREOF, AND SINTERING THE COMPRESSED BODY IN SAID CHAMBER TO EXPAND SAID BODY TO A PREDETERMINED DEGREE OF POROSITY.
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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) | 1965-01-08 | 1965-07-10 | 1966-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-08 | 1969-07-10 | 1970-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-08 | 1973-07-10 | 1974-01-09 | $7700.00 | Window Closed / Lapsed |