US3147053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing vacuum tubes
Assignee: RCA Corp
•
Filing: 1960-05-19
•
Granted: 1964-09-01
•
Expires: 1980-05-19
Abstract
No abstract record available.
Inventors
- 👤 George N Phelps
- 👤 Avram M Meshulam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:07
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF EVACUATING AND SEALING AN ENVELOPE HAVING A HOLE THEREIN AND USING A PLUG WHICH MATCHES SAID HOLE, COMPRISING THE STEPS OF APPLYING FRIT TO SAID PLUG, HEATING SAID PLUG AND FRIT TO AN ELEVATED TEMPERATURE TO COAT SAID PLUG WITH A SEALING FILM, PLACING SAID ENVELOPE AND SAID PLUG IN AN EVACUABLE CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID PLUG AND AT LEAST THE PORTION OF SAID ENVELOPE SURROUNDING SAID HOLE TO A LOWER TEMPERATURE THAN SAID ELEVATED TEMPERATURE TO SOFTEN THE GLASS AROUND SAID HOLE AND SAID FRIT COATING, AND PUSHING SAID PLUG INTO SAID HOLE TO SEAL SAID HOLE.
Claim 2
Independent Claim
103 words
THE METHOD OF EVACUATING AND SEALING AN ENVELOPE HAVING A HOLE THEREIN AND USING A PLUG WHICH MATCHES SAID HOLE, COMPRISING THE STEPS OF APPLYING FRIT TO SAID PLUG, HEATING SAID PLUG AND FRIT TO AN ELEVATED TEMPERATURE TO COAT SAID PLUG WITH A SEALING FILM, PLACING SAID ENVELOPE AND SAID PLUG IN AN EVACUABLE CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID PLUG AND AT LEAST THE PORTION OF SAID ENVELOPE SURROUNDING SAID HOLE TO A LOWER TEMPERATURE THAN SAID ELEVATED TEMPERATURE TO SOFTEN THE GLASS AROUND SAID HOLE AND SAID FRIT COATING, AND PUSHING SAID PLUG INTO SAID HOLE TO SEAL SAID HOLE.
References Cited (Backward Citations)
US2020476A
Cited
US2133492A
Cited
US2199804A
Cited
US2319234A
Cited
US2642633A
Cited
US2814100A
Cited
US2894294A
Cited
US2931142A
Cited
US2934392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |